<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
div{
position: relative;
background:#ccc;
width: 20px;
height: 20px;
display: inline-block;
}
div:before{
content: '';
width: 6px;
border: 1px solid rgb(80, 79, 79);
position: absolute;
transform: rotateZ(45deg);
top: 6.5px;
left: 6px;
}
div:after{
content: '';
width: 6px;
border: 1px solid rgb(80, 79, 79);
position: absolute;
transform: rotateZ(-45deg);
top: 11.5px;
left: 6px;
}
</style>
</head>
<body>
<div></div>
</body>
<script>
document.querySelector('div').onclick = function(){
this.toggle = !this.toggle;
if(this.toggle){
this.style.transform = 'rotateZ(90deg)';
}else{
this.style.transform = 'rotateZ(0deg)';
}
}
</script>
</html>
