How To Create A Popup Modal With CSS + JavaScript

A modal is a popup window that is displayed in front of the current page when pressed a button. Here’s my example

A modal is a popup window that is displayed in front of the current page when pressed a button.

Here’s my example, I have recently created a Twitter-like website using Django.

First step: style your parent section

The first thing you want to do is create a semi-transparent black background. To do that you need to create a parent element which wraps your content section.

<div class=”bg-modal”>
 <div class=”modal-content”>

 </div>
 </div>

Let’s style this modal now:

.bg-modal{
 width:100%;
 height:100%;
 background-color: black;
 }

You also need to tell the background modal to lay over top of the content.

position: absolute;

When you say absolute, you need to say where it is.

top:0px;

The problem here is if we do opacity: 0.7for decreasing opacity of background,this opacity value will transfer to the child element no matter whether you specify the child element’s opacity or not. The solution is not to specify opacity in here but in the background colour.

bacground-color: rgba(0,0,0,0.7) // the 4th number will be the opacity

Let’s look at what we have so far:

.bg-modal{
 width: 100%;
 height:100%;
 background-color: rgba(0,0,0,0.5); /* make it half transparent */
 position: absolute;
 top:0px;
 z-index: 1;
 display: none;  /* It will remain invisible until you open */
 justify-content: center; /*center horizontally*/ 
 align-items: center ; /* center vertically */}

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