How to use border in css

In CSS, the border property is used to add a border to an element. It consists of three sub-properties: border-width, border-style and border-color. border-width sets the border width, border-style sets the border style, and border-color sets the border color. You can also use border-top/right/bottom/left to simplify border settings in a specific direction.

Usage of border in CSS

In CSS, the border property is used to add a border to an element. It is a composite property consisting of the following sub-properties:

• border-width: Set the width of the border.
• border-style: Set the border style (such as solid line, dashed line or no border).
• border-color: Set the border color.

Usage:

To add a border to an element, you can use the following syntax:

selector {
  border: border-width border-style border-color;
}

For example:

p {
  border: 1px solid black;
}

This will add a solid black border to all <p></p> elements, with a width of 1px.

Sub-attribute description:

border-width:

• Value: length unit (such as px, em , %), or the keyword auto (automatically calculated by the browser).
• Default: medium (3px for most browsers).

border-style:

• Value:

  • none: No border
  • solid：solid line
  • dashed：dashed line
  • dotted：dotted line
  • double：double line
• Default value ：none

border-color:

• Value: color value (such as #000, rgb(0, 0, 0), keyword transparent (transparent)).
• Default value: browser default color (usually black).

Special usage:

The border attribute can also be used to simplify border settings:

• border-top/ right/bottom/left: Sets a border for a specific direction.
• border-radius: Set the rounded corners of the border.
• border-image: Specifies an image as the border.

For example:

div {
  border-top: 5px solid red;
  border-radius: 10px;
}

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