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CSS: Center Elements on Page
How to center elements both vertically and horizontally on the page.
There are a few ways to center elements on the screen even if the width and height is not known.
One way is to use display: table.
<!DOCTYPE html>
<html>
<head>
<title>title here</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
.center {
display: table;
position: absolute;
width: 100%;
height: 100%;
}
.center div {
display: table-cell;
vertical-align: middle;
text-align: center;
}
</style>
</head>
<body>
<div class="center">
<div>content</div>
</div>
</body>
</html>
Another way to center when the width and height is not known. > is a child selector and selects all the children of the DIV with class "middle".
<!DOCTYPE html>
<html>
<head>
<title>title here</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
.center > div {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
display: flex;
flex-wrap: wrap;
justify-content: center; /* or space-around */
align-items: center;
}
</style>
</head>
<body>
<div class="center">
<div>
<div>content</div>
</div>
</div>
</body>
</html>
And yet another way to center when the width and height is not known.
<!DOCTYPE html>
<html>
<head>
<title>title here</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
.center {
position: fixed;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div class="center">content</div>
</body>
</html>
Lastly, center when the width and height IS known. This is a less elegant solution than above but it may work well for things like images. It has good compatibility including with IE6 (a difficult browser to program for).
<!DOCTYPE html>
<html>
<head>
<title>title here</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
.center {
position: absolute;
top: 50%;
left: 50%;
margin-top: -50px; /* subtract half the height */
margin-left: -50px; /* subtract half the width */
width: 100px;
height: 100px;
text-align: center;
line-height: 100px;
background-color: red;
color: white;
font-weight: bold;
}
</style>
</head>
<body>
<div class="center">content</div>
</body>
</html>
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