Writing method: 1. Add "border-radius: rounded corner value;" style to the border to uniformly set the rounded corner size; 2. Add "border-top-left-radius: rounded corner value;", "border -top-right-radius: fillet value;" and other styles set the four-corner fillet size respectively.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
How to write css border into rounded border
The basic usage of rounded border (border-radius): border-radius attribute is a Abbreviation attribute, used to set the attributes of four rounded corners.
The most basic usage of the rounded border is to set four rounded corners with the same arc
border-top-left-radius：30px； //左上角 border-top-right-radius：30px； //右上角 border-bottom-left-radius：30px； //右下角 border-bottom-right-radius：30px； //左下角
If the four rounded corners are the same, it can be written as:
border-radius：30px；
Example :
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
.div1{
margin:0 auto;
background: darkcyan;
width:200px;
height:200px;
border:2px solid darkslategray;
border-radius:30px;
text-align: center;
line-height: 200px;
}
</style>
</head>
<body>
<div class="div1">圆角边框</div>
</body>
</html>Output result:
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