After applying position: relative; to the code, I noticed that the background popup window is no longer transparent. Why does centering the webpage affect the opacity of the background? I'm having trouble understanding this concept.
Thank you in advance to anyone who can provide some insight!
<html>
<head>
<style>
body {
background-color: white;
width: 960px;
margin: auto;
position: relative;
}
.one {
background: black;
-webkit-border-radius: 12;
-moz-border-radius: 12;
border-radius: 12px;
font-family: Book Antiqua;
color: #ffffff;
font-size: 60px;
text-align: center;
width: 75px;
height: 75px;
overflow:hidden;
float:left;
position:absolute;
transition: .5s ease;
top: 120px;
left: 140px;
text-align: center;
text-vertical-align: middle;
}
.overlay {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: rgba(0, 0, 0, 0.8);;
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;
}
</style>
</head>
<body>
<a class="one" id="one" href="#popup1" onclick="changeZIndex(this)">1</a>
<div id="popup1" class="overlay">
<div class="popup">
<h2>Here i am</h2>
<a class="close" href="#">×</a>
<div class="content">
1
</div>
</div>
</div>
</body>
</html>