CSS border-bottom-width

The border-bottom-width property sets the width of the bottom border of an element.

This property can have the following values:

Here is an example of how to use the border-bottom-width property:

Result:

    div {
      border-bottom-style: solid;
      border-bottom-width: 5px;
    }
  
<div>This is a div element with a bottom border.</div>

The code above sets a solid bottom border with a width of 5 pixels for a <div> element. You can adjust the value of border-bottom-width to change the thickness of the bottom border.