css3 outline adds outlines to div elements
Sometimes in order to make the style more beautiful, you can add outlines to divs appropriately. This can be achieved through the outline attribute.
outline contains the following attribute values;
outline-width: the thickness of the outline.
This attribute value contains 4 parameters: thin, medium, thick, length
thin: defines a thin outline;
medium: defines a medium outline;
thick: Defines a thick outline.
length: You can specify the thickness of the outline. Note, this value cannot be negative;
outline-style: The style of the outline.
Commonly used parameters for this attribute:
none: When set to none, the outline will not be displayed.
dotted: dotted outline,
dashed: dotted line Contour line,
solid: solid contour line.
outline-color: The color of the outline
Parameters of this attribute:
Color name: (red);
rgb color value: rgb( 255,255,255);
Hexadecimal color value: such as: #ff0000;
outline-offset: the offset value of the outline and the container. When this value is negative, an outline will appear inside the container.
The sample code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>无标题文档</title>
<style>
.aixuexi{
padding:20px;
position:fixed;
top:100px;
left:300px;
border:2px dashed #000;
width:100px;
height:100px;
line-height:100px;
background:#abcdef;
outline-width:10px;
outline-style:solid;
outline-color:#99FF00;
outline-offset:20px;
}
</style>
</head>
<body>
<div class="aixuexi"><a href="#">hello world</a></div>
</body>
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