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How to align boxes right under each other with flexbox

The point is that I want to implement this layout with html, css and js.
When you click on the button, the container should alternately become taller/smaller.
picture 1
picture 2
However, no fixed height should be passed, as is currently implemented.
Without using max-height, scaleY.
Also, text5 should be right under text2 and text6 right under text3 (as you can see in the picture) without using width or something similar.
The flex items should only be as large as the content.
I've also searched for solutions, but the search results weren't what I was looking for.
How can I transition height: 0; to height: auto; using CSS?
Flexbox not giving equal width to elements
Align divs under each other
let isOpen = false;
function toggleHeight() {
let row2 = document.getElementById('row2');
if(!isOpen){
isOpen= !isOpen;
row2.style.height = '120px';
//row2.style.height = 'auto';
}
else{
isOpen= !isOpen;
row2.style.height = '0';
}
}
.row1, .row2 {
display: flex;
gap: 10px;
background-color: #ccc;
}
.row2 {
height: 0;
transition: 0.25s ease;
overflow: hidden;
}
.col1 {
display:flex;
}
<div onclick="toggleHeight()">Click Me</div>
<div class="row1">
<div class="col1">
<div>
<div>text</div>
<div>text</div>
</div>
<div>
<div>text</div>
<div>text</div>
</div>
<div>
<div>text</div>
<div>text</div>
</div>
</div>
<div class="col2">
<div>text2</div>
<div>text2</div>
</div>
<div class="col2">
<div>text3</div>
<div>text3</div>
</div>
</div>
<div id="row2" class="row2">
<div class="col1">
<div>text4</div>
<div>text4</div>
</div>
<div class="col2">
<div>text5</div>
<div>text5</div>
</div>
<div class="col2">
<div>text6</div>
<div>text6</div>
</div>
</div>

I created exactly you wanted but the transition on height is not working!
const button = document.querySelector('button')
const row2 = document.querySelector('#row-2')
button.addEventListener('click', () => {
row2.classList.toggle('visible')
})
#import "https://cdn.jsdelivr.net/gh/KunalTanwar/normalize/css/normalize.inter.min.css";
body {
height: 100%;
display: grid;
place-items: center;
}
button {
padding: 4px;
border: 1px solid #c1c1c1;
}
.flex {
margin-top: 32px;
display: flex;
flex-direction: column;
}
.flex .row {
display: inherit;
column-gap: 16px;
}
.flex .row .col {
display: inherit;
padding-inline: 16px;
flex-direction: column;
}
.flex .row#row-2 {
height: 0px;
overflow: hidden;
background-color: red;
transition: height 250ms ease, overflow 250ms ease;
}
.flex .row#row-2.visible {
height: auto;
overflow: visible;
}
<div>
<button>Click Me!</button>
<div class="flex">
<div class="row" id="row-1">
<div class="col">
<span>texttexttext</span>
<span>texttexttext</span>
</div>
<div class="col">
<span>text2</span>
<span>text2</span>
</div>
<div class="col">
<span>text3</span>
<span>text3</span>
</div>
</div>
<div class="row" id="row-2">
<div class="col" style="align-self: center;">texttexttext</div>
<div class="col">
<span>text5</span>
<span>text5</span>
</div>
<div class="col">
<span>text6</span>
<span>text6</span>
</div>
</div>
</div>
</div>
P.S - remove padding-inline from .col.

dropdown menu is covered

i have problem like this
dropdown-menu covered
btw it isn't covered by other div, but dropdown-menu can't be out of the navbar, if i can ilustrate this it can be like this
ilustration of the navbar and dropdown-men
i make the navbar native with this code
<div id="topnav" class="topnav close-sidebar">
<div class="col d-inline">
<a href="#" onclick="sidebarToggle()">
<i class="fa-solid fa-bars"></i>
</a>
<p class="mt-1" style="text-align: left; font: normal normal normal 14px/17px Helvetica; letter-spacing: 0.34px;"><%: DateTime.Now.ToString("dddd, dd MMMM yyyy") %></p>
</div>
<div class="form-inline mr-5" style="max-width: 350px;">
<div class="d-inline">
<img class="mb-3" src="<%=Page.ResolveClientUrl("~/Assets/img/Worklist/atom-button-header-a-button-header-icon.svg")%>" alt="Alternate Text" />
</div>
<div class="d-inline mb-3">
<img style="height: 24px;" class="" src="<%=Page.ResolveClientUrl("~/Assets/img/Worklist/atom-icon-a-icon-globe.svg")%>" alt="Alternate Text" />
</div>
<div class="d-inline mb-3">
<div id="en" class="">EN</div>
</div>
<div class="d-inline" style="max-width: 250px;">
<div id="profile" class="text-right mb-3 ml-4" style="max-width: 250px; width: 150px;">
<div class="dropdown">
<div style="cursor: pointer;" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<div class="d-inline">
<img style="height: 32px; width: 32px;" src="<%= Page.ResolveClientUrl("~/Assets/img/Worklist/img_avatar.png") %>" class="img-fluid mr-2 rounded-circle" alt="Responsive image" />
</div>
<div class="d-inline">
Nama User
</div>
<div class="d-inline">
<img src="<%= Page.ResolveClientUrl("~/Assets/img/Worklist/atom-icon-a-icon-angle-down.svg") %>" alt="Text" />
</div>
</div>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton" style="opacity: 1 !important; z-index: 99;">
<a class="dropdown-item" href="#">Logout</a>
</div>
</div>
</div>
</div>
</div>
</div>
and the css of is like this
.topnav {
top: 0;
overflow: hidden;
height: 56px;
background: #1D2567 0% 0% no-repeat padding-box;
opacity: 1;
display: flex;
}
.close-sidebar {
margin-left: 56px;
}
for the dropdown-menu i used boostrap 4.3.1
when i inspect the web, the css is like this
css inspect 1
css inspect 2
css inspect 3
css inspect 4
Update:
i try to see my z-index using 3d view in ms edge, and the dropdown-menu is already in front of the navbar, but on the website it is covered
3D View

set position relative to parent or container and set position absolute to child elements. try to change overflow
.topnav {
top: 0;
overflow: hidden; // try to change this not hidden
height: 56px;
background: #1D2567 0% 0% no-repeat padding-box;
opacity: 1;
display: flex;
position: relative; // parent}
.close-sidebar {
margin-left: 56px;
position: absolute; // child};
if dont work let us to know and type more describe. thank you

You can try
.topnav {
top: 0;
overflow: hidden;
height: 56px;
background: #1D2567 0% 0% no-repeat padding-box;
opacity: 1;
display: flex;
position: relative;
}
.close-sidebar {
margin-left: 56px;
position: absolute;
z-index: 10;
}
This should work. Let us know if this doesn't

Try using this
.topnav {
top: 0;
overflow: hidden;
height: 56px;
background: #1D2567 0% 0% no-repeat padding-box;
opacity: 1;
display: flex;
z-index: 999;
}
.close-sidebar {
margin-left: 56px;
}

Align Div Container to the Bottom of a Display Flex

I have to build a Modular Window for a chat! I allready got a Toolbar and an Flex conatiner which gets filled. Now i got the Problem, that i want to add an Div for a chat input field. I tried nearly everything to align this thing to the bottom but nothing works.
Here is how it should look like:
"Message input" has to be aligned to the bottom
This is my actual HTML-Code:
<div id="chat_dialog" class="modal" style="height: 600px; overflow-y: hidden">
<div class="toolbar_standard">
<div class="toolbar_standard_control_row">
<img src="/static/images/ic_arrow_back_white.svg" class="toolbar-button" data-bind="click: closeChatDialog">
<div style="font-size: 20px; color: white">Chat</div>
<div style="font-size: 20px; color: white; padding-left: 40%" data-bind="html: chatPartnerName"></div>
<div style="..."></div>
</div>
</div>
<div style="display:flex; height: 100%;">
<div data-bind="foreach: contacts" style="width: 300px; overflow-y: scroll;">
<div class="overviewlist_row waves-effect" style="padding-left: 5px; padding-right: 5px" data-bind="click: $parent.onClick.bind($parent)">
<div>
<div>
<p data-bind="html: name"></p>
</div>
</div>
</div>
</div>
<div style="background-color: #e6e6e6; flex-grow: 1; overflow-y: scroll; padding-bottom: 10px">
<div style="height: 80%; display: flex; flex-direction: column;">
<div id="spinner" class="spinner">
<div class="bounce1"></div>
<div class="bounce2"></div>
<div class="bounce3"></div>
</div>
<div data-bind="foreach: messages" style="padding-left: 15px; min-height: 306px">
<p data-bind="html: message, css: messageClassName"></p>
</div>
<div style="height: auto">
<div class="input-field col s6" style="background-color: white; height: auto;">
<input id="message_to_send" type="text" class="validate" data-bind="value: message_to_send" style="width: 94%;">
<a id="sendChat" class="clickable-icon" data-bind="click: sendMessage" style="padding-top: 0px"><img src="/static/images/ic_send_black.svg"></a>
<label for="message_to_send">Nachricht</label>
</div>
</div>
</div>
</div>
</div>
</div>
And this is how it looks like in the Browser:
Here you can see that is is floating under the Div of the "Messages" and that its dynamically moving whit the size of the "Messages" Div!
How and where do i have to set the the alignment to the bottom?

First point: Don't use inline CSS without any necessity.
You can bring your message to bottom by positioning. Try to change your code as below
Add position:relative to <div style="height: 80%; display: flex; flex-direction: column;"> and add position:absolute; bottom:0; to <div style="height: auto">.
Edit: If it doesn't bring your message to exact bottom, then you are suppose to work on the height of <div style="height: 80%; display: flex; flex-direction: column;"> on this part.

Just add position: absolute; and bottom: 0px; in your textarea or container of textarea

Add position: fixed; and bottom:0; to your message input container, to fix the width overlap issue just add property of width: inherit; that will take the width value of parent element.
Otherwise you can assign the parent width to your message container dynamically using JavaScript code :
$(document).ready(()=> {
var parentWidth = $('.parent-element').width();
$('.message-container').width(parentWidth);
});

How can I have a menu appear over an image after it is hovered on?

I am creating a portfolio page that will have images of different things I've worked on. When I hover on an image I would like for it to gray out (as if there was a div overlapping it with 0.4 opacity) and for a few buttons (view source, view demo) to pop up over the image.
I want to lay these "portfolio items" in three bootstrap columns. I looked at overlapping a div on top of it that would be hidden until hover using a z-index but I can't figure out how to position it while also using bootstrap to keep it responsive.
Here is what I have so far. Is there another easier way to do this?
<div id="portfolio-page">
<div class="row">
<div class="col-lg-4 col-lg-offset-4">
<h2 class="center-text">My Portfolio</h2>
<hr>
</div>
</div>
<div class="row">
<div class="col-lg-8 col-lg-offset-2" id="portfolio-items">
<div class="row">
<div class="col-lg-4">
<div class="portfolio-item">
<img src="includes/img/headers.jpg" class="img-responsive"></img>
</div>
</div>
</div>
</div>
</div>
</div>

You just need a little CSS to do this.
I've set the opacity of .portfolio_text to 0 but I set it to 1 when you hover over its parent .portfolio. I've also added a transition so it fades as opposed to just popping in.
.portfolio {
position: relative;
height: 200px;
width: 200px
}
.portfolio img,
.portfolio_text {
width: 100%;
height: 100%
}
.portfolio_text {
position: absolute;
display: flex;
flex-direction: column;
align-items: center;
justify-content: space-around;
color: #fff;
top: 0;
left: 0;
background: rgba(100, 100, 100, .4);
opacity: 0;
transition: opacity .3s cubic-bezier(.25, .8, .25, 1)
}
.portfolio:hover .portfolio_text {
opacity: 1
}
<div class="portfolio">
<img src="http://silayexportinc.com/wp-content/uploads/2016/09/placeholder-3.jpg" />
<div class="portfolio_text">
<span>Look at my Buttons</span>
<button>Button 1</button>
<button>Button 2</button>
<button>Button 3</button>
</div>
</div>

Trying to get equal height columns with expanding text whilst using overflow with CSS transitions

Ok, I have this code I have done up here on how I need this solution to function:
Codepen: http://codepen.io/anon/pen/MaOrGr?editors=110
HTML:
<div class="container">
<div class="wrapper row">
<div class="box col-sm-4">
<div class="cta-background">
</div>
<div class="rollover-wrap">
<div class="details">
some text
</div>
<div class="summary">
fhdhjofsdhohfsohfsouhofuhufhoufdsh
fskjoifhspofhdsohfdsohfohfsd
fsdujhofhofdshofhohfds
fdsolhfsdohfodshfohfdsohfosd
fsdljhfdsouhfdsohhfso
</div>
</div>
</div>
<div class="box col-sm-4">
<div class="cta-background">
</div>
<div class="rollover-wrap">
<div class="details">
some text
</div>
<div class="summary">
fhdhjofsdhohfsohfsouhofuhufhoufdsh
fskjoifhspofhdsohfdsohfohfsd
fsdujhofhofdshofhohfds
fdsolhfsdohfodshfohfdsohfosd
fsdljhfdsouhfdsohhfso
</div>
</div>
</div>
<div class="box col-sm-4">
<div class="cta-background">
</div>
<div class="rollover-wrap">
<div class="details">
some text
</div>
<div class="summary">
fhdhjofsdhohfsohfsouhofuhufhoufdsh
fskjoifhspofhdsohfdsohfohfsd
fsdujhofhofdshofhohfds
fdsolhfsdohfodshfohfdsohfosd
fsdljhfdsouhfdsohhfso
</div>
</div>
</div>
</div>
</div>
SCSS / CSS:
.wrapper {
.box {
position: relative;
height: 340px;
overflow: hidden;
margin-top: 10px;
&:hover > .rollover-wrap {
bottom: 260px;
}
.cta-background {
background-image: url('http://ideas.homelife.com.au/media/images/8/2/8/9/0/828947-1_ll.jpg');
background-size: cover;
height: 260px;
}
.rollover-wrap {
position: relative;
bottom: 0;
transition: 0.3s;
z-index: 2;
}
.details {
font-size: 24px;
font-weight: bold;
padding: 20px;
background-color: gray;
height: 80px;
}
.summary {
height: 260px;
font-size: 15px;
padding: 15px;
background-color: #E29222;
z-index: 2;
}
}
}
This is working fine and is the effect I am wanting; however, I need to support the gray area being able to have multiple lines of text, and if one does, then the other adjacent gray sections should expand to the same height.
At the moment it uses fixed heights to assist with hiding and bringing in the transition on hover, but this hinders the ability for the gray area to expand. Even if it could expand, the other boxes need to match the height.
I have tried using flexbox and changing the html layout to no avail.
I don't mind if the image & summary sections have a fixed height, but the gray area needs to be able to expand to it's content.
Is there anyway to do what I want to do without JavaScript? If not, is there a clean way to do it with JavaScript/jQuery that doesn't have too much of a messy fallback?