css实现四角边框

请添加图片描述

代码：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>css实现四角边框</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html,
        body {
            background-color: #333;
            height: 100%;
            color: green;
            /*绿色yyds*/
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /**
        *css var函数
        *定义:root { --变量名: color}
        *引用var(--变量名)
        */
        :root {
            --borderColor: #03A9F3;
        }

        div {
            cursor: pointer;
            text-align: center;
            padding: 10px;
            width: 200px;
            height: 100px;
            background: linear-gradient(to left, var(--borderColor), var(--borderColor)) left top no-repeat, linear-gradient(to bottom, var(--borderColor), var(--borderColor)) left top no-repeat, linear-gradient(to left, var(--borderColor), var(--borderColor)) right top no-repeat, linear-gradient(to bottom, var(--borderColor), var(--borderColor)) right top no-repeat, linear-gradient(to left, var(--borderColor), var(--borderColor)) left bottom no-repeat, linear-gradient(to bottom, var(--borderColor), var(--borderColor)) left bottom no-repeat, linear-gradient(to left, var(--borderColor), var(--borderColor)) right bottom no-repeat, linear-gradient(to left, var(--borderColor), var(--borderColor)) right bottom no-repeat;
            background-size: 2px 20px, 20px 2px, 2px 20px, 20px 2px;
            transition: all .4s ease;
            border: 1px solid transparent;
        }

        div:hover {
            border: 1px solid var(--borderColor)
        }
    </style>
</head>

<body>
    <div>我可是四角边框哦</div>
</body>

</html>

代码：

<!DOCTYPE html>
<html lang="en">

	<head>
		<meta charset="UTF-8">
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<title>css实现四角边框</title>
		<style>
			* {
				margin: 0;
				padding: 0;
				box-sizing: border-box;
			}

			html,
			body {
				background-color: #333;
				height: 100%;
				color: green;
				/*绿色yyds*/
				display: flex;
				justify-content: center;
				align-items: center;
			}

			/**
        *css var函数
        *定义:root { --变量名: color}
        *引用var(--变量名)
        */
			:root {
				--borderColor: #33cdfa;
			}

			div.logo {
				box-shadow: 0 0 1.5vw #2F4F4F inset;
				cursor: pointer;
				text-align: center;
				height: 100px;
				line-height: 100px;
				padding: 0px 20px;
				background: linear-gradient(to left, var(--borderColor), var(--borderColor)) left top no-repeat,
					linear-gradient(to bottom, var(--borderColor), var(--borderColor)) left top no-repeat,
					linear-gradient(to left, var(--borderColor), var(--borderColor)) right top no-repeat,
					linear-gradient(to bottom, var(--borderColor), var(--borderColor)) right top no-repeat,
					linear-gradient(to left, var(--borderColor), var(--borderColor)) left bottom no-repeat,
					linear-gradient(to bottom, var(--borderColor), var(--borderColor)) left bottom no-repeat,
					linear-gradient(to left, var(--borderColor), var(--borderColor)) right bottom no-repeat,
					linear-gradient(to left, var(--borderColor), var(--borderColor)) right bottom no-repeat;
				background-size: 2px 10px, 10px 2px, 2px 10px, 10px 2px;
				transition: all .4s ease;
				border: 1px solid transparent;
				position: absolute;
				left: 0px;
				top: 10px;
				color: white;
				font-size: 30pt;
				letter-spacing: 0.1em;
			}

			div.logo:hover {
				border: 1px solid var(--borderColor)
			}
		</style>
	</head>

	<body>
		<div class="logo">css实现四角边框</div>
	</body>

</html>

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