How to set border lines in css

To set the CSS border line, use the following properties in sequence: border-color specifies the color (hexadecimal or name); border-style specifies the style (none, solid, dotted, dashed, double); border- width specifies the width (pixels or units); border-radius specifies the corner radius (pixels or a single or four values). Comprehensive settings, such as red solid border, 2px width, 5px rounded corners: element { border: 2px solid #FF0000; border-radius: 5px; }

Border line settings in CSS

In CSS, the border line is a decorative element used to highlight or separate elements. To set the border line, you need to use the border property and its sub-properties.

Set the border line color

To set the border line color, use the border-color property. This property accepts a hexadecimal color code or color name value.

element {
  border-color: #FF0000;
  /* 设置红色边框线 */
}

Set the border line style

To set the border line style, use the border-style attribute. This property accepts the following values:

• none: No border line
• solid: Solid border line
• dotted: Dotted border line
• dashed: Dotted border line
• double: Double border line

element {
  border-style: solid;
  /* 设置实线边框线 */
}

Set the border width

To set the width of the border, use the border-width property. This property accepts a pixel value or a relative unit value (such as em or %).

element {
  border-width: 2px;
  /* 设置 2px 宽的边框线 */
}

Set border rounded corners

To add rounded corners to the border line, use the border-radius property. This property accepts a single pixel value (all corners have the same radius) or four pixel values ​​(each corner has a different radius).

element {
  border-radius: 5px;
  /* 设置所有角 5px 的圆角 */
}

Comprehensive Example

Combine all these properties to create an element with a solid red border, 2px wide, and 5px rounded on all corners:

element {
  border: 2px solid #FF0000;
  border-radius: 5px;
}

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