效果图:
代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>三角形</title>
<style>
div {
box-sizing: border-box;
width: 96px;
height: 96px;
background-color: white;
position: relative;
left: 300px;
top: 300px;
border: 1px solid #E2E3E4;
}
div::before {
width: 0;
height: 0;
content: "";
position: absolute;
left: 39px;
top: -11px;
border-left: solid 11px transparent;
border-bottom: solid 11px #E2E3E4;
border-right: solid 11px transparent;
}
div::after {
width: 0;
height: 0;
content: "";
position: absolute;
left: 40px;
top: -10px;
border-left: solid 10px transparent;
border-bottom: solid 10px white;
border-right: solid 10px transparent;
}
</style>
</head>
<body>
<div>
</div>
</body>
</html>