We would like to know how to create a triangle div with CSS.
<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.arrow-up:after {<!--from w ww. jav a 2s.c o m-->
position: absolute;
content: "";
width: 0;
height: 0;
margin-top: 1px;
margin-left: 2px;
border-left: 10px solid transparent;
border-right: 10px solid transparent;
border-bottom: 10px solid white;
}
.arrow-up:before {
position: absolute;
content: "";
width: 0;
height: 0;
border-left: 12px solid transparent;
border-right: 12px solid transparent;
border-bottom: 12px solid black;
}
</style>
</head>
<body>
<div class="arrow-up"></div>
</body>
</html>
The code above is rendered as follows: