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HTML - Second IMG hover issue

I have 2 semicircles stuck next to each other forming a circle. When I hover on the left semicircle, the right one lowers it's opacity (which is what is supposed to do) but when I hover on the right one, the opacity doesn't change at all.
HTML:
<div id="animation-components">
<img src="leftball.svg" alt="" class="animation-item-01">
<img src="rightball.svg" alt="" class="animation-item-02">
</div>
CSS:
#animation-components {}
.animation-item-01 {
display: inline;
position: relative;
margin-bottom: 240px;
margin-top: 100px;
transform: translate(631px,80px);
height: 320px;
transition: opacity ease 0.5s;
}
.animation-item-02 {
display: inline;
position: relative;
margin-bottom: 240px;
margin-top: 100px;
transform: translate(627px,80px);
height: 320px;
transition: opacity ease 0.5s;
}
.animation-item-01:hover + .animation-item-02{
opacity: 50%;
}
.animation-item-02:hover + .animation-item-01{
opacity: 50%;
}
What can I alter to make this work?

The issue is that you can only select the next sibling with the adjacent sibling selector.
.element-1 + .element-2 /* good */
.element-2 + .element-1 /* not so good */
Since .animation-item-02 comes after .animation-item-01, there is no way to select the previous .animation-item-01 from .animation-item-02
Doing the following will fix the issue:
#animation-components:hover > div {
opacity: 50%;
}
#animation-components > div:hover {
opacity: 100%;
}

CSS Combinators can't be used to apply styles to elements before target element.
The adjacent sibling selector (+) will aply to all adjacent elements, not to it's opposite elements.
CSS It's in the name: Cascading Style Sheets only supports styling in cascading direction, not up.
To achieve the desired, you can do the folowwing:
#animation-components:hover img {
opacity: .5;
}
#animation-components img:hover{
opacity: 1;
}
<div id="animation-components">
<img src="https://via.placeholder.com/150.png/ff0000" alt="" class="animation-item-01">
<img src="https://via.placeholder.com/150.png/ff0000" alt="" class="animation-item-02">
</div>

It might just be me but I find it heaps easier to throw in just a little bit of javascript and avoid messy css combinators. Heres my fix, script goes anywhere in your html file, I put it after the closing body tag.
<script>
function fadeOut(obj) {
document.getElementById(obj).style.animationName = "fadeOut";
}
function fadeIn(obj) {
document.getElementById(obj).style.animationName = "fadeIn";
}
</script>
#item1 {
display: inline;
position: relative;
margin-bottom: 240px;
margin-top: 100px;
transform: translate(631px,80px);
height: 320px;
animation-duration: 0.5s;
animation-fill-mode: forwards;
}
#item2 {
display: inline;
position: relative;
margin-bottom: 240px;
margin-top: 100px;
transform: translate(627px,80px);
height: 320px;
animation-duration: 0.5s;
animation-fill-mode: forwards;
}
#keyframes fadeOut {
0%{opacity: 1;}
100%{opacity: 0.5;}
}
#keyframes fadeIn {
0%{opacity: 0.5;}
100%{opacity: 1;}
}
<div id="animation-components">
<img src="leftball.svg" alt="" id="item1" onmouseover="fadeOut('item1')" onmouseout="fadeIn('item1')">
<img src="rightball.svg" alt="" id="item2" onmouseover="fadeOut('item2')" onmouseout="fadeIn('item2')">
</div>
Also its just a me thing, but you have class attributes where id attributes should be. If your applying seperate styles to two completely seperate elements its a good idea to use id, but if your applying same style to two elements

CSS keyframe animation not working on floated element

Hi I am building a simple slider to present a project.
The slider is based on swipe.js.org. I am doing everything as I should, except one thing: While every slide div contains only one image, one slide contains 2 overlapping images #img7-1 & #img7-2. I am overlaying those two images to fade the opacity of the upper image.
Below is my css. The order of elements represents the structure of the elements in the DOM.
I also have a link to the presentation at the end if you just want to look at the page source.
.swipe {
overflow: hidden;
visibility: hidden;
position: relative;
}
.swipe-wrap {
overflow: hidden;
position: relative;
}
.swipe-wrap > div {
float: left;
width: 100%;
position: relative;
}
.swipe-wrap > div img {
display: block;
width: 100vw;
height: 100vh;
object-fit: contain;
}
#img7-1{
position: relative;
z-index: 1;
}
#img7-2{
position: absolute;
z-index: 2;
animation: fade 1.5 ease-in-out 1.5s alternate infinite running;
}
#keyframes fade{
from {opacity: 0%;}
to {opacity: 100%;}
}
You can view the presentation here, all the code, styles & js (except cdn library) is on that html page.
If anyone knows this, please help me - coding is not my best skill.
Thanks everyone.
Edit:
div elements affected in dom:
<div class="swipe-wrap">
<div>
<img id="img7-1" src="/images/rivian/Rivian_Storyboards-7-1.jpg">
<img id="img7-2" src="/images/rivian/Rivian_Storyboards-7-2.jpg">
</div>
</div>

I ran your code through the CSS validator and it came back saying your shorthand notation for animation was incorrect so this fixed that problem. My next question is what is #img7-2 referring to in your html? I don't see what this animation is being used on in your source code.
EDITED:
Once you add top:0 to the img7-2 you can now see the effect happening, before the image was placed outside the browser window. You can change the timing however you'd like.
#img7-2 {
position: absolute;
z-index: 2;
/*animation: overlay 6s ease-in-out infinite running;*/
animation-name: fade;
animation-duration: 1.5s;
animation-timing-function: ease-in-out;
animation-delay: 1.5s;
animation-direction: alternate;
animation-iteration-count: infinite;
animation-play-state: running;
top:0
}

How to build a CSS animation that "slides in", revealing a text/div after it finishes sliding?

I am trying to mimic the CSS animations from a website here: https://stanographer.com/
I want to copy the way the site:
starts by showing a full screen black div sliding away to the right
"loads" the black background (div tags) behind text (as in "Hi, I'm Stanley Sakai"), expanding left to right and
"loads" the text over the black background div, expanding left to right.
Now you might ask, "Why not just inspect the page, look at the classes on the divs and text, then inspect the CSS sheet in the network tab?" And I've tried that. The CSS looks weird. My friend said it is pre-processed by SASS, whatever that means. Anyway, I cannot decipher the code.
I've been to a few different StackOverflow pages (here's one) & over a dozen different pages on Google. I learned about using keyframes but I haven't figured out how to recreate the effect on Stanographer.com. My friend, who owns the website, also provided this example, but I don't get how to apply it to individual divs. He said something about using the z-index but I just don't see it.
I know that to make the page start with a full black screen & then slide out, I have to trigger a class change using JavaScript. I have:
let blackStuff = document.getElementById("blackness");
window.addEventListener("load", () => {
console.log("loaded");
blackStuff.setAttribute("class", "black-box-out");
},
false
);
.black-box {
position: fixed;
float: left;
top: 0;
width: 100%;
height: 100%;
bottom: 0;
background-color: #000;
z-index: 999999;
-webkit-animation: powerslide 0.5s forwards;
-webkit-animation-delay: 2s;
animation: powerslide 0.5s forwards;
animation-delay: 2s;
}
#-webkit-keyframes powerslide {
100% {
left: 0;
}
}
#keyframes powerslide {
100% {
left: 0;
}
}
.black-box-out {
margin-left: 100%;
animation: slide 0.5s forwards;
-webkit-transition: slide 0.5s forwards;
transition: slide 0.5s forwards;
}
<div id="blackness" class="black-box"></div>
But this just makes the "blackness" div disappear instantly on page load. I want it to slide out. Clearly, I don't get how to use CSS animations.
If you are interested in seeing more of what doesn't work, read on. Otherwise, you can skip this section: it only shows my failed trials.
I've learned how to make a CSS animation expand horizontally from 0:
.wrapper {
position: relative;
overflow: hidden;
width: 500px;
height: 50px;
border: 1px solid black;
}
.slide-custom {
width: 500px;
height: 50px;
background: cyan;
position: relative;
-webkit-animation: slideIn 2s forwards;
animation: slideIn 2s forwards;
}
/* moz and webkit keyframes excluded for space */
#keyframes slideIn {
0% {
transform: scaleX(0);
}
100% {
transform: scaleX(1);
}
}
<div class="wrapper slide-custom">
<h1 class="slide-custom">
<span>MEET ROLY POLY.</span>
<!-- expands horizontally from 0 width to 100% width -->
</h1>
</div>
And I've learned to make text "slide in" from the left, though it starts at 100% width when I want it to start at 0% width:
/* CSS */
.test-slide {
animation-duration: 3s;
animation-name: testSlide;
}
#keyframes testSlide {
from {
margin-left: 0%;
width: 50%;
}
to {
margin-left: 100%;
width: 100%;
}
}
<div class="test-slide">
<h1><span>ABOUT.</span></h1>
<!-- will slide in from the left -->
</div>
There's more -- unfortunately none of it mimics the website I'm trying to copy.

Explanation
There are multiple ways to achieve what you want actually. I did not opt to animate width. The first few frames of the animation will be not as expected.
So instead, we can use clip-path. What clip-path basically does is masking. You can "crop" a div such that only a part of it is visible. We will utilise clip-path and ::before or ::after pseudo-element (either is fine) to create this animation. What we need to do:
Create the pseudo-element and position it such that it covers (is on top) the whole animatable element (position: absolute)
Set the pseudo-element's background to black
Using clip-path, mask the animatable element to display no parts of the element (this will also cause the pseudo-element to not be displayed as it is part of the element). The direction of the clipping is important. The direction here is from the right side to the left side.
Using animation and #keyframes, unmask the previously masked div. This will reveal it slowly from the left side to the right side (because initially, we masked it from the right to left; upon unmasking, the reverse direction happens)
Upon unmasking the element, the pseudo-element will be on top of the text we want to display
After a short while later, mask the pseudo-element (not the whole element) from the right direction to the left direction, again using clip-path so that the text seems revealed slowly
It works! However, I recommend reading about clip-path. Also, one really handy clip-path CSS generator I really like to use is this (if you want to clip from the right to left, you should drag the points from the right to left). I also highly recommend reading about CSS positioning (a staple in good CSS animations). You needn't be using z-index: 9999; you generally want to keep track of the z-index you use.
Solution
Here's a working solution using the described method. Try running it.
* {
box-sizing: border-box;
margin: 0;
padding: 0;
font-family: Helvetica;
}
body,
html {
width: 100%;
height: 100%;
}
#wrapper {
background: #555555;
width: 100%;
height: 100%;
color: white;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
#wrapper * {
margin: 5px;
}
.heading {
font-size: 3em;
padding: 10px 5px;
}
.caption {
font-size: 1em;
padding: 5px;
font-family: Courier;
}
.animatable {
position: relative;
clip-path: polygon(0 0, 0 0, 0 100%, 0% 100%);
animation: .75s cubic-bezier(1,-0.01,.12,.8) 1s 1 reveal forwards;
}
.animatable::after {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: #20262b;
padding: inherit;
animation: .75s cubic-bezier(1,-0.01,.12,.8) 1.75s 1 hideBlack forwards;
}
#keyframes reveal {
from { clip-path: polygon(0 0, 0 0, 0 100%, 0% 100%); }
to { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }
}
#keyframes hideBlack {
from { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }
to { clip-path: polygon(100% 0, 100% 0, 100% 100%, 100% 100%); }
}
<div id="wrapper">
<div class="heading animatable">Hi, I am Richard!</div>
<div class="caption animatable">I am a person.</div>
</div>
Although the simple animation you wanted can be created using merely CSS, I still suggest you read about how to make animations using JavaScript and the various libraries it has in making animations. This is because once there are many animations and transitions going on, it becomes hard to keep track of animations (especially when you want animations to start after another animation ends). A good library is anime.js (do explore more options before settling on one). Furthermore, notice how the animations only appear upon scrolling down in the website you provided? That's doable only with JS (one such method is using IntersectionObserver API provided by most browsers).

Here you have some CSS3 animations, you trigger that animation when the .entrance-animation gets the .active class.
You'll need an observer to watch when the item gets into view and, when the item is visible, you add the .active class to it.
Hope it helps!
setTimeout(() =>
{
let animate = document.querySelectorAll('.entrance-animation');
animate.forEach(item => item.classList.add('active'));
}
,1000);
.entrance-animation
{
position: relative;
color: blueviolet;
white-space: nowrap;
font-size: 24px;
width: 0;
overflow: hidden;
transition: width 0.5s ease;
}
.entrance-animation::before
{
content: '';
position: absolute;
top: 0;
right: 0;
height: 100%;
width: 100%;
background-color: black;
z-index: 10;
transition: width 0.5s ease;
transition-delay: 0.5s;
}
.entrance-animation.active
{
width: 100%;
}
.entrance-animation.active::before
{
width: 0%;
}
<p class="entrance-animation">
Hello
</p>
<p class = "entrance-animation">
Here we are
</p>

You can use CSS3 transitions or maybe CSS3 animations to slide in an element.
For browser support: http://caniuse.com/
I made two quick examples just to show you how I mean.
CSS transition (on hover)
Demo One
Relevant Code
.wrapper:hover #slide {
transition: 1s;
left: 0;
}
In this case, Im just transitioning the position from left: -100px; to 0; with a 1s. duration. It's also possible to move the element using transform: translate();
CSS animation
Demo Two
#slide {
position: absolute;
left: -100px;
width: 100px;
height: 100px;
background: blue;
-webkit-animation: slide 0.5s forwards;
-webkit-animation-delay: 2s;
animation: slide 0.5s forwards;
animation-delay: 2s;
}
#-webkit-keyframes slide {
100% { left: 0; }
}
#keyframes slide {
100% { left: 0; }
}
Same principle as above (Demo One), but the animation starts automatically after 2s, and in this case I've set animation-fill-mode to forwards, which will persist the end state, keeping the div visible when the animation ends.
Like I said, two quick example to show you how it could be done.
EDIT: For details regarding CSS Animations and Transitions see:
Animations
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_animations
Transitions
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_transitions
Hope this helped.

CSS - On hover moving image littlebit left, if not hovered then back to original position

I've been trying doing it, but it doesn't work. It should move that image left 10px, but it doesn't. That div has left css inside it, I think it's because of that. I tried !important, but it didn't work.
Here's JSFiddle: https://jsfiddle.net/jwbvxhv0/1/
$(".seen").bind("webkitAnimationEnd mozAnimationEnd animationEnd", function(){
$(this).removeClass("animated")
})
$(".seen").hover(function(){
$(this).addClass("animated");
})
#-webkit-keyframes example {
0% {
left: 0px;
}
25% {
left: 10px ! important;
}
100% {
left: 0px;
}
}
.seen.animated {
position: relative;
-webkit-animation-name: example;
-webkit-animation-duration: 2s;
}

You can use translate transform for left/right movement as it does not affect any neighbour elements' position. To make the transition smooth, you need to add transition on transform property for your image.
Update:
If you have a button next to the img, which has higher z-index as you mentioned. You need to apply the same effect to a parent element that contains both - that image and that button.
.moving-left
{
height: 100px;
position: relative;
transition: transform 0.3s ease;
transform: translateX(0px);
width: 100px;
}
.moving-left:hover
{
transform: translateX(10px);
}
.moving-left button
{
left: 8px;
position: absolute;
top: 30px;
z-index: 99;
}
<div class="moving-left">
<img src="http://placehold.it/100X100" alt="" />
<button>Button here</button>
</div><!--.moving-left-->

Recreating a text animation (source within)

I would like to recreate the text animation seen in this screen video I did of this website theme: http://themeforest.net/item/js-responsive-theme/full_screen_preview/7630276
Here is the video to show you the animation:
https://drive.google.com/file/d/0B3HFm_t_vjVpVUNiWVRVdW14aWs/edit?usp=sharing
I am unsure of where to begin and cannot find anything like it through my search so far, I am open to anything to create this such as jQuery. Thank you for any help!

I'd do this with two absolute positioned texts, one gray (or semi transparent) second one, on top set to overflow:hidden. Then I'd just animate the width of the second container.
How do You like the idea? :)
edit:
little tweaking, but idea the same - fiddle for You: http://jsfiddle.net/Lr4PQ/
quite important CSS rule:
white-space: nowrap;
to prevent breaking lines when width of text node is smaller than text's.
edit 2:
Of course, idea behind lets You to achieve the result using pure CSS, jQuery's role is just animating width.
HTML:
<div class="container">
<div class="text upper">You`re the boss</div>
<div class="text ">You`re the boss</div>
</div>
CSS:
body {
background:#000;
}
.container {
position:absolute;
left:30%;
top:20%;
width:auto;
/*position container as You wish*/
}
.text {
text-transform:uppercase;
font-family:sans-serif;
color:#FFF;
opacity:.2;
white-space: nowrap;
font-size:30px;
}
.text.upper {
position:absolute;
opacity:1;
overflow:hidden;
width:0%;
}
jQuery:
$('.text.upper').animate({width:'100%'},3000).animate({width:'0%'},3000);

The animation is achieved in pure CSS3:
jsBin demo
HTML:
<div class="modal">
<h1 data-content="YOUR BEAUTIFUL NAME">YOUR BEAUTIFUL NAME</h1>
</div>
CSS:
.modal h1 {
color: #626161;
font-size: 30px;
left: 50%;
margin-left: -125px;
margin-top: -15px;
position: absolute;
text-align: center;
top: 50%;
}
.modal h1:before {
animation: 5s ease 0s normal none 1 loading;
-o-animation: 5s ease 0s normal none 1 loading;
-ms-animation: 5s ease 0s normal none 1 loading;
-moz-animation: 5s ease 0s normal none 1 loading;
-webkit-animation: 5s ease 0s normal none 1 loading;
color: #E2E2E2;
content: attr(data-content);
max-width: 100%;
overflow: hidden;
position: absolute;
white-space:nowrap;
}
#keyframes loading {
0% { max-width: 0%; }
}
#-o-keyframes loading {
0% { max-width: 0%; }
}
#-ms-keyframes loading {
0% { max-width: 0%; }
}
#-moz-keyframes loading {
0% { max-width: 0%; }
}
#-webkit-keyframes loading {
0% { max-width: 0%; }
}
One of the reason they used a single h1 instead of overlaying two h1 elements and animating the second's one width is simply cause for a better SEO a page should contain only one h1 element. Also using content: attr(data-content); is quite fun so...