将左圆角添加到Bootstrap中的元素
要将左圆角添加到<div>之类的元素，然后使用Bootstarp4中的rounded-left类。
设置圆角左角-
<div class="one rounded-left"></div>
您可以尝试运行以下代码以实现四舍五入的类-
示例
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<style>
.one {
width: 200px;
height: 100px;
background-color: #FFFF00;
margin: 8px;
}
</style>
</head>
<body>
<div class="container">
<h2>Rounded Corner</h2>
<p>We have three rectangles with left rounded corner:</p>
<div class="one rounded-left"></div>
<div class="one rounded-left"></div>
<div class="one rounded-left"></div>
</div>
</body>
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