DIV制作小三角

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<style>
    .body{
        height: 100px;
        width: 100px;
        background-color:blue;
        /*相对位置*/
        position: relative;
        /*无用代码*/
        margin: 100px 100px;
    }
    /**/
    .triangle1{
        width: 0;
        height: 0;
        border: 10px solid red;
        border-top: none;
        border-right-color: transparent;
        border-left-color: transparent;
        /*绝对位置*/
        position: absolute;
        /*将小三角形向下移90个像素*/
        top: 90px;
        /*将小三角形向右移10个像素*/
        left: 10px;
    }
    .triangle2{
        width: 0;
        height: 0;
        border: 10px solid red;
        border-left-color: transparent;
        border-bottom-color: transparent;
        border-top-color: transparent;
        position: absolute;
        top: 30px;
        left: -20px;
    }
    .triangle3{
        width: 0;
        height: 0;
        border: 30px solid red;
        border-top: none;
        border-left-color: transparent;
        border-bottom-color: transparent;
        border-top-color: transparent;
        position: absolute;
        top: 0px;
        left: 40px;
    }
    .triangle4{
        width: 0;
        height: 0;
        border: 10px solid red;
    }
    .triangle5{
        width: 0;
        height: 0;
        border: 10px solid red;
        border-left-color: transparent;
        border-top-color: transparent;
        position: absolute;
        bottom: 0px;
        right: 0px;
    }
    .triangle6{
        width: 0;
        height: 0;
        border: 10px solid red;
        border-left-color: transparent;
        border-right-color: transparent;
        border-top: none;
        position: absolute;
        left: 36px;
        bottom: 100px;
    }
    .triangle7{
        width: 0;
        height: 0;
        border: 10px solid red;
        border-bottom-color: transparent;
        border-top-color: transparent;
        border-right-color: transparent;
        position: absolute;
        top: 30px;
        left: 100px;
    }
</style>
<body>
<div class="body">
    <div class="triangle1">

    </div>
    <div class="triangle2">

    </div>
    <div class="triangle3">

    </div>
    <div class="triangle4">

    </div>
    <div class="triangle5">

    </div>
    <div class="triangle6">

    </div>
    <div class="triangle7">

    </div>
</div>
</body>
</html>
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