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React CSS animation-delay property does not work

just a quick question regarding animated elements in React.js - I have noticed that when trying to make use of the animation-delay property in CSS, that React does not seem to apply this rule at all for some reason.
For example, I am trying to make a basic loading component, which just has a series of basic circles moving about in sequence, the CSS for which is below:
.--loaderContainer {
position: relative;
left: 50%;
top: 50%;
transform: translateX(-50%), translateY(-50%);
width: 4rem;
height: 4rem;
}
.--loaderContainer:nth-child(n) {
width: 1rem;
height: 1rem;
border-radius: 9999px;
margin: 0;
padding: 0;
position: absolute;
animation-name: spin;
animation-duration: 2s;
animation-timing-function: ease;
animation-iteration-count: infinite;
animation-fill-mode: both;
}
.--loaderContainer:first-child {
background-color: red;
transform: rotate(270deg);
animation-delay: -1.5s;
}
.--loaderContainer:nth-child(2) {
background-color: blue;
transform: rotate(180deg);
animation-delay: -1s;
}
.--loaderContainer:nth-child(3) {
background-color: green;
transform: rotate(90deg);
animation-delay: -0.5s;
}
.--loaderContainer:nth-child(4) {
background-color: yellow;
}
#keyframes spin {
0%,
100% {
transform: translate(0);
}
25% {
transform: translate(160%);
}
50% {
transform: translate(160%, 160%);
}
75% {
transform: translate(0, 160%);
}
}
As far as I can tell, this should stagger each of the child elements in sequence, performing the same animation but at different times. However, for some reason, React simply plays the animation, with no delay whatsoever and has all four elements animate at the exact same time.
It seems like a really basic issue to be having and while I have looked up a variety of answers, I just can't seem to find any concrete solutions, so would be super appreciative for any help. Thanks!

If all four circles are seen, I think this animation should be working properly.
The negative animation-delay values ensures that four circles start at different points of the animation, rather than putting an actual delay.
More about animation-delay
Without it, they will start at same point and move together while stacking with each other, resulting in only one circle is seen (the last yellow circle since it's on top of stack).
Here is a basic example for testing the effect of animation-delay by toggling it on and off for all the circles, it can run with the "run code snippet" button below.
Hope it will help.
const btn = document.querySelector("button");
const loaders = document.querySelectorAll(".--loaderContainer");
btn.addEventListener("click", () => {
loaders.forEach((loader) => loader.classList.toggle("no-delay"));
btn.textContent = loaders[0].classList.contains("no-delay")
? "turn delay on"
: "turn delay off";
});
.--loaderContainer {
position: relative;
left: 50%;
top: 50%;
transform: translateX(-50%), translateY(-50%);
width: 4rem;
height: 4rem;
}
.--loaderContainer:nth-child(n) {
width: 1rem;
height: 1rem;
border-radius: 9999px;
margin: 0;
padding: 0;
position: absolute;
animation-name: spin;
animation-duration: 2s;
animation-timing-function: ease;
animation-iteration-count: infinite;
animation-fill-mode: both;
}
.--loaderContainer:first-child {
background-color: red;
transform: rotate(270deg);
animation-delay: -1.5s;
}
.--loaderContainer:nth-child(2) {
background-color: blue;
transform: rotate(180deg);
animation-delay: -1s;
}
.--loaderContainer:nth-child(3) {
background-color: green;
transform: rotate(90deg);
animation-delay: -0.5s;
}
.--loaderContainer:nth-child(4) {
background-color: yellow;
}
#keyframes spin {
0%,
100% {
transform: translate(0);
}
25% {
transform: translate(160%);
}
50% {
transform: translate(160%, 160%);
}
75% {
transform: translate(0, 160%);
}
}
button {
text-transform: uppercase;
padding: 6px;
}
section {
width: 100px;
height: 100px;
position: relative;
}
div.--loaderContainer.no-delay:nth-child(n) {
animation-delay: 0s;
opacity: 0.8;
}
body {
background-color: #aaa;
}
<button>turn delay off</button>
<section>
<div class="--loaderContainer"></div>
<div class="--loaderContainer"></div>
<div class="--loaderContainer"></div>
<div class="--loaderContainer"></div>
</section>

Animation not working despite the class is added

I want to add my beating animation only to the text between arrows (arrows shouldn't have beating).
But unfortunately I'm unable to find the reason why the animation is not working (the heart class which contains the animation is added to the container of text but no animation is visible).
How can I fix this?
setTimeout(() => prepareLabelShow("This is the caption"), 2500);
const prepareLabel = document.querySelector(".prepareLabel");
function prepareLabelShow(text, state) {
function startBeating() {
const prepareLabelGroup = document.getElementById("prepare-label-group");
prepareLabelGroup.classList.add("heart");
}
prepareLabel.innerHTML = `<span class="right-arrow arrow">‹</span><div style="display:inline" id="prepare-label-group">${text}</div><span class="left-arrow arrow">›</span>`;
startBeating();
prepareLabel.classList.add("prepareLabelShow");
prepareLabel.classList.remove("prepareLabelHide");
} // end of prepareLabelShow function
.prepare-label-container {
position: absolute;
overflow: hidden;
height: 10vh;
width: 100%;
z-index: 11;
top: 68.5vh;
padding-top: 10px;
margin: 0;
-ms-transform: translateY(-50%);
transform: translateY(-50%);
/*outline: 0.1vw dashed orange;*/
}
.prepareLabel {
position: relative;
font-family: "Vazir";
direction: rtl;
text-shadow: 1px 1px 2px rgba(0, 0, 0, 1);
text-align: center;
width: 100%;
color: #f8f7fa;
opacity: 0;
margin: 0 auto;
}
.prepareLabelShow {
animation: prepareLabelAnimeShow 0.3s ease-in-out;
animation-fill-mode: forwards ;
}
#-webkit-keyframes prepareLabelAnimeShow {
0% { opacity: 0; top: 4vh }
100% { opacity: 1; top: 1.2vh }
}
.heart {
animation: beat .5s infinite alternate;
}
#keyframes beat {
0% { opacity:1; transform: scale(1); }
100% { opacity:1; transform: scale(0.8); }
}
.arrow {
/*color: #e9e1f2;
font-size: 1.2vw;*/
color: #ff9900;
font-size: 1.3vw;
}
.left-arrow {
padding-right: 7vw;
transition: 1s ease-in-out;
}
.right-arrow {
padding-left: 7vw;
}
<div class ="prepare-label-container">
<p class="prepareLabel"></p>
</div>
I did not simplified the code in purpose.
The desired result is to see the beating animation in the text inside two arrows.

Contents are rotating with loader

I am trying to create a loader component in my application for that I have used the following code.
CSS
#app {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 1000;
}
#maincontainer {
display: block;
position: relative;
left: 50%;
top: 50%;
width: 150px;
height: 150px;
margin: -75px 0 0 -75px;
border-radius: 50%;
border: 3px solid transparent;
border-top-color: #3498db;
-webkit-animation: spin 2s linear infinite;
animation: spin 2s linear infinite;
}
#maincontainer:before {
content: "";
position: absolute;
top: 5px;
left: 5px;
right: 5px;
bottom: 5px;
border-radius: 50%;
border: 3px solid transparent;
border-top-color: #e74c3c;
-webkit-animation: spin 3s linear infinite;
animation: spin 3s linear infinite;
}
#maincontainer:after {
content: "";
position: absolute;
top: 15px;
left: 15px;
right: 15px;
bottom: 15px;
border-radius: 50%;
border: 3px solid transparent;
border-top-color: #f9c922;
-webkit-animation: spin 1.5s linear infinite;
animation: spin 1.5s linear infinite;
}
#-webkit-keyframes spin {
0% {
-webkit-transform: rotate(0deg);
-ms-transform: rotate(0deg);
transform: rotate(0deg);
}
100% {
-webkit-transform: rotate(360deg);
-ms-transform: rotate(360deg);
transform: rotate(360deg);
}
}
#keyframes spin {
0% {
-webkit-transform: rotate(0deg);
-ms-transform: rotate(0deg);
transform: rotate(0deg);
}
100% {
-webkit-transform: rotate(360deg);
-ms-transform: rotate(360deg);
transform: rotate(360deg);
}
}
HTML
<div id="app">
<div id="maincontainer">
I have some contents here
</div>
</div>
Loader is working fine but the issue is the content inside the inner div also rotating with the loader. I want the contents to be stable in the page and only rotate the loader.
Jsfiddle link
Can some one please help me to resolve this.

The easiest solution by far is going to be to simply put the animation on a different element than the contents you don't want animated.
(Incidentally: it's no longer necessary to include those vendor-specific -webkit and -ms prefixed CSS elements; animation and transform have been broadly supported for years now.)
#app {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 1000;
}
#spin, #maincontainer {
display: block;
position: relative;
left: 50%;
top: 50%;
width: 150px;
height: 150px;
margin: -75px 0 0 -75px;
}
/* Combining the repeated declarations: */
#spin, #spin:before, #spin:after {
content: "";
position: absolute;
border-radius: 50%;
border: 3px solid transparent;
}
#spin {
border-top-color: #3498db;
animation: spin 2s linear infinite;
}
#spin:before {
top: 5px;
left: 5px;
right: 5px;
bottom: 5px;
border-top-color: #e74c3c;
animation: spin 3s linear infinite;
}
#spin:after {
top: 15px;
left: 15px;
right: 15px;
bottom: 15px;
border-top-color: #f9c922;
animation: spin 1.5s linear infinite;
}
#keyframes spin {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
<div id="app">
<div id="spin"></div>
<div id="maincontainer">
I have some contents here
</div>
</div>

Grow line from center out on page load with CSS?

I am trying to accomplish the effect from this answer but without the text: Expand bottom border on hover
And know this can be accomplished by growing the entire div from the center as with here: http://jsfiddle.net/wNXLY/ but have no idea how to create this effect with line (i.e keeping the height static)
I have created my line here:
.line {
background: white;
width: 300px;
top: 10%;
height: 3.2px;
margin:auto;
position: relative;
}
And need to have the line grow from the center on page load. How can I do this?

You can use css animation with animation-fill-mode set to forwards, setting #keyframes width from 0% to n%, left from 50% to 5%
body {
width:100%;
}
div {
display:block;
position:absolute;
top:45%;
left:50%;
border-bottom:4px solid red;
width:0%;
text-align:center;
animation: line 2s linear forwards;
}
#keyframes line {
from {
left:50%;
width:0%;
}
to {
left:5%;
width:90%;
}
}
<div></div>

#keyframes line_animation {
from {
width: 0%;
}
to {
width:100%;
}
}
.line {
border-bottom: solid 3px #019fb6;
border-top-width: 0px;
animation-name: line_animation;
animation-duration: 4s;
animation-timing-function: linear;
}
Like this
<hr class="line" />

i have utilised display grid and SCSS to configure an authentic border animation
.top-border {
grid-area: tb;
// background: green;
border-bottom: $border-config;
width: 0%;
animation: horizontal-border-animation $animation-duration / 2 forwards;
animation-delay: $animation-delay;
}
.bottom-border {
grid-area: bb;
//to prevent being visible since it is going to be delayed
width: 0%;
// background: yellow;
border-top: $border-config;
animation: horizontal-border-animation $animation-duration / 2 forwards;
// because both right and bottom will start animating after top and left + the intitial delay
animation-delay: $animation-duration / 2 + $animation-delay;
}
#keyframes expand-border-width {
from {
width:0%;
}
to {
width:100%;
}
}
check my sample to gain an explicit clarification
https://codepen.io/ino0r/pen/eYEgvrZ

You don't need keyframes for this if you're just transitioning the effect.
<div class="line"></div>
.line {
width: 0%;
height: 1px;
position: absolute;
left: 50%;
background: #f00;
transition: all 1s;
}
.line:hover {
width: 100%;
left: 0%;
}

Changing CSS Animation anchor point

I have the following page (see image)
When I click the red button, I want a div to animate when it shows to the user. However, I want the animation to come from the button. Right now the animation comes from the center of the page.
Here's the code I have
#keyframes fadeInScale {
0%{
opacity:0;
transform: scale(0.5);
}
100%{
opacity:1;
transform: scale(1);
}
}
#keyframes fadeOutScale {
0%{
opacity:1;
transform: scale(1);
}
100%{
opacity:0;
transform: scale(0.5);
}
}
.overlay {
position: absolute;
top: 0;
z-index: 500;
width: 100%;
height: 100%;
left: 0;
right: 0;
bottom: 0;
}
.fade-scale-in {
display: block;
animation: fadeInScale 0.3s 1 ease-out;
}
.fade-scale-out {
display: block;
animation: fadeOutScale 0.3s 1 ease-out;
}
When I click on the red circle, the user sees an overlay page (which is actually a div with class overlay that is absolutely positioned). I add fade-scale-in class to the div (with class overlay). The div then transitions from the center of the screen and grows to fit the user's screen. I want it so that the div transitions from the red circle. Can I use transforms to make this happen?
Here's the code. As you notice, when you click on the yellow circle, the div animates from the center and not from the yellow circle:
https://jsfiddle.net/e4g71y4m/3/

You can do this by adding transform-origin: top left; to the .overlay element. (Don't forget the prefixes (-webkit, -moz etc.)
var overlay$ = $('.overlay');
overlay$.bind('animationend webkitAnimationEnd MSAnimationEnd oAnimationEnd', function(e) {
console.debug('test');
if (e.animationName !== undefined && e.animationName == "fadeOutScale") {
overlay$.addClass('hide');
} else if (e.originalEvent.animationName !== undefined && e.originalEvent.animationName == "fadeOutScale") {
overlay$.addClass('hide');
}
});
$('.click').on('click', function() {
overlay$.removeClass('hide').addClass('fade-scale-in');
});
$('.click-again').on('click', function() {
overlay$.removeClass('hide').addClass('fade-scale-out');
});
#keyframes fadeInScale {
0% {
opacity: 0;
transform: scale(0.5);
}
100% {
opacity: 1;
transform: scale(1);
}
}
#keyframes fadeOutScale {
0% {
opacity: 1;
transform: scale(1);
}
100% {
opacity: 0;
transform: scale(0.5);
}
}
.hide {
display: none;
}
.overlay {
position: absolute;
top: 0;
z-index: 500;
width: 100%;
height: 100%;
left: 0;
right: 0;
bottom: 0;
background: red;
transform-origin: top left;
}
.click {
background: yellow;
border-radius: 50%;
width: 100px;
height: 100px;
line-height: 100px;
text-align: center;
cursor: pointer;
}
.fade-scale-in {
display: block;
animation: fadeInScale 0.3s 1 ease-out;
}
.fade-scale-out {
display: block;
animation: fadeOutScale 0.3s 1 ease-out;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="click">Click me</div>
<div class="overlay hide">
Test
<div class="click-again">Click me again</div>
</div>