When I was learning CSS, I learned about the concept of CSS margins. So, what are CSS margins? Outside the border is the margin. The margin is transparent by default, so it will not block any elements behind it. Next, this article will introduce you to the relevant content of the CSS margin attribute.
First of all, we should know that the margin attribute of css is margin.
margin clears the surrounding (outer border) element area. The margin has no background color and is completely transparent.
margin can change the top, bottom, left, and right margins of the element individually, or you can change all attributes at once.
Let’s look at a picture to see what the css margin attribute value corresponds to:
The css margin attribute value can be up to four: Represents the top margin, right margin, bottom margin, and left margin respectively. It can also be three: indicating top margin, left and right margins, and bottom margin. It can also be two: indicating top and bottom margins, left and right margins. At least one: indicates four-sided margins.
css margin attribute value can be auto, the browser automatically calculates the margin, and block-level elements will be displayed horizontally and centered; the attribute value can be percentage, and the percentage is calculated based on the width of the parent element; the attribute value can be CSS length unit, the value can be negative. Attribute values can be inherited.
Then let’s look directly at the implementation of css marginsCode
Note: The default value of the css margin attribute is 0, so if there is no If margin declares a value, no margins will appear.
css margin implementation code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网</title>
<style>
p{
background-color:yellow;
}
p.margin{
margin:2cm 4cm 3cm 4cm;
}
</style>
</head>
<body>
<p>没有指定外边距大小</p>
<p class="margin">有外边距有外边距有外边距有外边距有外边距有外边距有外边距有外边距有外边距有外边距有外边距有外边距</p>
</body>
</html>css margin implementation The effect is as follows:
Finally:
The above is the entire content of this article. If you want to know more about the css margin attribute margin, you can refer to css learning manual.
The above is the detailed content of What is css margin? Introduction to css margin properties. For more information, please follow other related articles on the PHP Chinese website!
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