<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style>
#star-six {
width: 100px;
height: 100px;
border: 1px solid black;
position: relative;
}
#star-six::before {
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
border-bottom: 100px solid #000;
border-left: 99px solid transparent;
content: "";
}
#star-six::after {
position: absolute;
left: 1px;
right: 0;
top: 1px;
bottom: 0;
border-bottom: 99px solid #fff;
border-left: 98px solid transparent;
content: "";
}
</style>
</head>
<body>
<div id="star-six"></div>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style>
#star-six {
width: 100px;
height: 100px;
border: 1px solid black;
position: relative;
}
#star-six::before {
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
border-bottom: 100px solid #000;
border-left: 99px solid transparent;
content: "";
}
#star-six::after {
position: absolute;
left: 1px;
right: 0;
top: 1px;
bottom: 0;
border-bottom: 99px solid #fff;
border-left: 98px solid transparent;
content: "";
}
</style>
</head>
<body>
<div id="star-six"></div>
</body>
</html>