HTML button on click show overlay layer - html

Question

I am trying to show an overlay for full page when button on click. I intended to add an iframe in the content div for pop up. Here is my HTML:
And CSS to show and hide the overlay:
.box {
width: 20%;
margin: 0 auto;
background: rgba(255,255,255,0.2);
padding: 35px;
border: 2px solid #fff;
border-radius: 20px/50px;
background-clip: padding-box;
text-align: center;
}
.button {
font-size: 1em;
padding: 10px;
color: #fff;
border: 2px solid blue;
border-radius: 20px/50px;
text-decoration: none;
cursor: pointer;
transition: all 0.3s ease-out;
}
.button:hover {
background: blue;
}
.overlay {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: rgba(0, 0, 0, 0.7);
transition: opacity 500ms;
visibility: hidden;
opacity: 0;
}
.overlay:target {
visibility: visible;
opacity: 1;
}
.popup {
margin: 70px auto;
padding: 20px;
background: #fff;
border-radius: 5px;
width: 30%;
position: relative;
transition: all 5s ease-in-out;
}
.popup h2 {
margin-top: 0;
color: #333;
font-family: Tahoma, Arial, sans-serif;
}
.popup .close {
position: absolute;
top: 20px;
right: 30px;
transition: all 200ms;
font-size: 30px;
font-weight: bold;
text-decoration: none;
color: #333;
}
.popup .close:hover {
color: orange;
}
.popup .content {
max-height: 30%;
overflow: auto;
}
<div style="height: 1200px;">
<div class="box">
<a class="button" href="#popup1">Show Overlay</a>
</div>
<div id="popup1" class="overlay">
<div class="popup">
<h2>Title</h2>
<a class="close" href="#">×</a>
<div class="content">
Content
</div>
</div>
</div>
</div>
My jsfiddle
However, there is a slight issue with the styling. The overlay does not cover the part below when scrolling down. It only covers the part before start scrolling down. I tried to set the height to 100% but to no futile.
Any ideas how to fix this?
Thanks!

Answer 1

Use position: fixed; instead of position: absolute;. position absolute set an auto height based on window height not body.
.box {
width: 20%;
margin: 0 auto;
background: rgba(255, 255, 255, 0.2);
padding: 35px;
border: 2px solid #fff;
border-radius: 20px/50px;
background-clip: padding-box;
text-align: center;
}
.button {
font-size: 1em;
padding: 10px;
color: #fff;
border: 2px solid blue;
border-radius: 20px/50px;
text-decoration: none;
cursor: pointer;
transition: all 0.3s ease-out;
}
.button:hover {
background: blue;
}
.overlay {
position: fixed;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: rgba(0, 0, 0, 0.7);
transition: opacity 500ms;
visibility: hidden;
opacity: 0;
}
.overlay:target {
visibility: visible;
opacity: 1;
}
.popup {
margin: 70px auto;
padding: 20px;
background: #fff;
border-radius: 5px;
width: 30%;
position: relative;
transition: all 5s ease-in-out;
}
.popup h2 {
margin-top: 0;
color: #333;
font-family: Tahoma, Arial, sans-serif;
}
.popup .close {
position: absolute;
top: 20px;
right: 30px;
transition: all 200ms;
font-size: 30px;
font-weight: bold;
text-decoration: none;
color: #333;
}
.popup .close:hover {
color: orange;
}
.popup .content {
max-height: 30%;
overflow: auto;
}
<div style="height: 1200px;">
<div class="box">
<a class="button" href="#popup1">Show Overlay</a>
</div>
<div id="popup1" class="overlay">
<div class="popup">
<h2>Title</h2>
<a class="close" href="#">×</a>
<div class="content">
Content
</div>
</div>
</div>
</div>