Detailed explanation of CSS border properties: padding, margin and border

Detailed explanation of CSS border properties: padding, margin and border

CSS is a style sheet language used to control and layout web page elements. In web design, the border attribute is one of the most important parts. This article will introduce in detail how to use the border attribute in CSS and provide specific code examples.

1. padding (Padding)

The padding property is used to set the padding of an element, which is the space between the element content and the element boundary. We can set the padding size using positive numbers or percentage values. The padding can be set to the top, right, bottom, and left directions respectively, or it can be set to a unified value at once. The following is some common sample code:

.container {
  padding-top: 10px;
  padding-right: 20px;
  padding-bottom: 30px;
  padding-left: 40px;
}

/* 或者使用统一的数值设置 */
.container {
  padding: 10px;
}

2. margin (margin)

margin attribute is used to set the margin of an element, that is, the element boundary and the adjacent element boundary the space between. Similar to the padding attribute, we can also use positive numbers or percentage values ​​to set the size of the margins. The margins can also be set to the top, right, bottom, and left directions respectively, or they can be set to a unified value at once. Here are some common sample codes:

.container {
  margin-top: 10px;
  margin-right: 20px;
  margin-bottom: 30px;
  margin-left: 40px;
}

/* 或者使用统一的数值设置 */
.container {
  margin: 10px;
}

3. border (border)

The border property is used to set the border style, width and color of the element. There are many types of border styles, such as solid lines, dotted lines, dotted lines, etc., which can be set through border-style. The width of the border can be set as a fixed value or a percentage value, or using keywords. The color of the border can be set as a hexadecimal value, RGB value or color name. The following are some common sample codes:

.container {
  border-top: 1px solid #000;
  border-right: 2px dashed #ff0000;
  border-bottom: 3px dotted rgb(255, 0, 0);
  border-left: 4px double blue;
}

.container {
  border: 1px solid black;
}

In addition to the above methods of setting the border attributes individually, we can also combine them to set the border style of the element. Here is an example:

.container {
  padding: 10px;
  margin: 10px;
  border: 1px solid black;
}

In this example, the element's padding, margins, and border are all set to 10px, and the border is a solid black line 1px wide.

Summary:

Boundary attributes (padding, margin and border) are a very important part of CSS and are used to control and layout web page elements. We can use padding to adjust the distance between element content and element boundaries; use margins to adjust the distance between element boundaries and adjacent element boundaries; use borders to set the distance between elements. Border style, width and color. At the same time, we can also combine these border properties to set the style of the element border.

I hope this article can help readers better understand and use the border properties in CSS, and play a greater role in web design.

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