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2.3.1 Border Width

The border-width property specifies the width of the four borders. The width can be set as a specific size (in px, pt, cm, em, etc) or by using one of the three pre-defined values: thin, medium, or thick:

Example 1: The border-width Property part 1

Demonstration of the different border widths:

p.one {
  border-style: solid;
  border-width: 5px;
}

p.two {
  border-style: solid;
  border-width: medium;
}

p.three {
  border-style: dotted;
  border-width: 2px;
}

p.four {
  border-style: dotted;
  border-width: thick;
}

Specific Side Widths

The border-width property can have from one to four values (for the top border, right border, bottom border, and the left border):

Example 2: The border-width Property part 2

p.one {
  border-style: solid;
  border-width: 5px 20px; /* 5px top and bottom, 
  20px on the sides */
}

p.two {
  border-style: solid;
  border-width: 20px 5px; /* 20px top and bottom, 
  5px on the sides */
}

p.three {
  border-style: solid;
  border-width: 25px 10px 4px 35px; /* 25px top, 10px 
  right, 4px bottom and 35px left */
}