一 .三角形繪製樣式如下：
<style>
.triple {
width: 0px;
height: 0px;
border-top:100px solid transparent;
border-left: 100px solid transparent;
border-bottom: 100px solid red;
border-right: 100px solid transparent;
}
</style>
<div class="triple">
</div>
二.自適應矩形繪製如下
<style>
.square {
width: 20%;
height: 20vw;
background: red;
}
</style>
<div class="square">
</div>
一個div裏面最多可以繪製幾個圓 6個圓
<!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{
height: 100px;
width: 100px;
border-radius: 100px;
position: absolute;
top: 30%;
left: 30%;
border: solid 10px purple;
box-shadow: 0px 0px 0px 10px red,0px 0px 0px 10px black inset;
background: gray;
}
div::after{
content:' ';
background-color: yellow;
border-radius: 100px;
display: block;
z-index: -1;
position: relative;
left: -30px;
top: -30px;
width: 160px;
height: 160px;
}
div::before{
content:' ';
background-color: green;
border-radius: 100px;
display: block;
z-index: -2;
position: absolute;
left: -40px;
top: -40px;
width: 180px;
height: 180px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
