求助求助!哪位大佬知道这种蓝色背景用CSS可以画出来吗?求指导

 

<!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,chrome=1" />
	<title> 页面名称 </title>
<style type="text/css">
.test {
	width: 100px;
	height: 50px;
	background-color: #00f;
	margin: 0px 25px;
	position: relative;
}
.test:before {
	content: "";
	display: block;
	position: absolute;
	width: 0px;
	height: 0px;
	top: 0;
	left: -25px;
	border: 25px solid transparent;
	border-top-color: #00f;
	border-bottom-color: #00f;
}
.test:after {
	content: "";
	display: block;
	position: absolute;
	width: 0px;
	height: 0px;
	top: 0;
	left: 100%;
	border: 25px solid transparent;
	border-left-color: #00f;
}
</style>
</head>
<body>

<div class="test"></div>

</body>
</html>

 

应该可以,等下我试试

https://blog.csdn.net/qq_26388781/article/details/112603469?spm=1001.2014.3001.5501

看看我的 

可以,伪元素

https://www.jb51.net/css/734268.html

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