css实现倒三角样式

<!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>
        .arrows0 {
            width: 0;
            height: 0;
            border-width: 10px;
            border-style: solid;
            border-color: #00ffff  #00ff00 #ff0000 #000000;
        }
        .arrows1 {
            border-width: 10px;
            border-style: solid;
            border-color: transparent transparent #ff0000 transparent;
            width: 0;
            height: 0;
        }
        .message {
            width: 150px;
            height: 60px;
            border: 1px solid #ff0000;
            border-radius: 10px;    
            position: relative;
        }
        .arrows2 {
            width: 0;
            height: 0;
            border-width: 10px;
            border-style: solid;
            border-color: transparent transparent #ff0000 transparent;
            position: absolute;
            top: -20px;
            left: 20px;
        }
        .arrows2::after {
            content: '';
            display: block;
            width: 0;
            height: 0;
            border-width: 10px;
            border-style: solid;
            border-color: transparent transparent #fff transparent;
            position: absolute;
            top: -9px;
            left: -10px;
        }
    </style>
</head>
<body>
    <h3>边框10px的div</h3>
    <div class="arrows0"></div>

    <h3>实现倒三角</h3>
    <div class="arrows1"></div>

    <h3>实现带边框的三角--类似消息框</h3>
    <div class="message">
        <div class="arrows2"></div>
    </div>
   
    
</body>
</html>
效果：
css实现倒三角样式

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