Pure CSS3 Modal Example

Modals are basically dialog's that pop out when a user clicks a link, image, button etc. This example will show you how you can do it with pure CSS3, no JavaScript needed. The modal contains a title, content, and close button so users can close the dialog, as well as a background that will also close the dialog when clicked.

HTML CSS JavaScript Output Live Updates

body {
    font-family: Arial, Helvetica, sans-serif;
}
input[type="checkbox"] {
	display:none;
}
input[type="checkbox"]:checked ~ .modal,
input[type="checkbox"]:checked ~ .modal-background {
	display: block;
}
.modal-background {
	width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    position: fixed;
    top: 0;
    left: 0;
    display: none;
    z-index: 9998;
}
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    display: none;	
    width: 300px;
    height: 300px;
    background-color: #fff;
    box-sizing: border-box;
    z-index: 9999;
}
.modal > p {
	padding: 15px;
    margin: 0;
}
.modal-header {
	background-color: #f9f9f9;
    border-bottom: 1px solid #dddddd;
    box-sizing: border-box;
    height: 50px;
}
.modal-header h3 {
	margin: 0;
    box-sizing: border-box;
    padding-left: 15px;
    line-height: 50px;
    color: #4d4d4d;
    font-size: 16px;
    display: inline-block;
}
.modal-header label {
	box-sizing: border-box;
    border-left: 1px solid #dddddd;
    float: right;
    line-height: 50px;
    padding: 0 15px 0 15px;
    cursor: pointer;
}
.modal-header label:hover img {
	opacity: 0.6;
}
/* below is optional, it is just an example for the blue button */
.example-label {
	box-sizing: border-box;
    display: inline-block;
    padding: 10px;
    background-color: #375d91;
    color: #f9f9f9;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
}
.example-label:hover {
	background-color: #3c669f;
}

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body {
    font-family: Arial, Helvetica, sans-serif;
}
input[type="checkbox"] {
    display:none;
}
input[type="checkbox"]:checked ~ .modal,
input[type="checkbox"]:checked ~ .modal-background {
    display: block;
}
.modal-background {
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    position: fixed;
    top: 0;
    left: 0;
    display: none;
    z-index: 9998;
}
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    display: none;  
    width: 300px;
    height: 300px;
    background-color: #fff;
    box-sizing: border-box;
    z-index: 9999;
}
.modal > p {
    padding: 15px;
    margin: 0;
}
.modal-header {
    background-color: #f9f9f9;
    border-bottom: 1px solid #dddddd;
    box-sizing: border-box;
    height: 50px;
}
.modal-header h3 {
    margin: 0;
    box-sizing: border-box;
    padding-left: 15px;
    line-height: 50px;
    color: #4d4d4d;
    font-size: 16px;
    display: inline-block;
}
.modal-header label {
    box-sizing: border-box;
    border-left: 1px solid #dddddd;
    float: right;
    line-height: 50px;
    padding: 0 15px 0 15px;
    cursor: pointer;
}
.modal-header label:hover img {
    opacity: 0.6;
}
/* below is optional, it is just an example for the blue button */
.example-label {
    box-sizing: border-box;
    display: inline-block;
    padding: 10px;
    background-color: #375d91;
    color: #f9f9f9;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
}
.example-label:hover {
    background-color: #3c669f;
}

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<input type="checkbox" id="modal">
<label for="modal" class="example-label">Open Modal</label>
<label for="modal" class="modal-background"></label>
<div class="modal">
    <div class="modal-header">
        <h3>Modal Title</h3>
        <label for="modal">
            <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAdVBMVEUAAABNTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU1NTU0N3NIOAAAAJnRSTlMAAQIDBAUGBwgRFRYZGiEjQ3l7hYaqtLm8vsDFx87a4uvv8fP1+bbY9ZEAAAB8SURBVBhXXY5LFoJAAMOCIP4VBRXEv5j7H9HFDOizu2TRFljedgCQHeocWHVaAWStXnKyl2oVWI+kd1XLvFV1D7Ng3qrWKYMZ+MdEhk3gbhw59KvlH0eTnf2mgiRwvQ7NW6aqNmncukKhnvo/zzlQ2PR/HgsAJkncH6XwAcr0FUY5BVeFAAAAAElFTkSuQmCC" width="16" height="16" alt="">
        </label>
    </div>
    <p>Content for the modal</p>
</div>