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<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <title>边框border</title>
    <style type="text/css">
        div{
            width:500px;
            height:500px;
            /* border:10px solid green; */
            border:10px;
            /* border-style:groove; 默认none; dashed短虚线; dotted圆点虚线; double双实线; groove 有点3D感觉的线; hidden */
            /* border-top-style:dashed;
            border-right-style:dotted;
            border-bottom-style:double;
            border-left-style:outset; */
            border-style:dashed dotted double outset;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>

边框
border:5px solid red;
border-top...

border-style: outset;
border-style: solid dotted dashed double; 上右下左
border-right..-style
border-style: none; 没有边框

border-width: 5px;thin 、medium 和 thick 分别设置为等于 5px、3px 和 2px
border-width: 15px 5px 15px 5px;
border-width: 15px 5px; 值复制
border-right..-width

border-color: blue rgb(25%,35%,45%) #909090 red;
border-right...-color
border-color: transparent; 透明边框，有边框，只不过不可见

border-radius 边框转角