Setting method: 1. Use the border-radius attribute, the syntax "border-radius: fillet radius;"; 2. Use the border-image attribute to create a border with a picture with rounded corners, the syntax " border-image:url(rounded image address) 20 fill;”.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
htmlSet border rounded corners
1. Use the border-radius attribute
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
div {
border: 2px solid #a1a1a1;
padding: 10px 40px;
background: #dddddd;
width: 300px;
border-radius: 25px;
}
</style>
</head>
<body>
<div>border-radius 属性为元素添加圆角边框！ </div>
</body>
</html>
2. Use the border-image attribute
Use an image with rounded corners to create a border
Example:
Use pictures: 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.border_image{
width:100px;
border:double gray 10px;
border-image:url(https://img.php.cn/upload/article/000/000/024/61b839d3982fc635.png) 20 fill;
text-align:center;
color:white;
}
</style>
</head>
<body>
<div class="border_image">1</div>
</body>
</html>
Recommended tutorial: "html video tutorial"
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