Width
{width: XXunits/%}The width property lets you set the width of an element.
Width can be specified using absolute or relative units. Relative units calculate the width of an element using the width of the element's containing block. It is illegal to use negative values for width. The width property cannot be applied to table rows.
Example:
img {width: 1.5in}
If you are using a CSS-enabled browser, the Project Cool logo is 1.5 inches wide.
img {width: 50px}
If you are using a CSS-enabled browser, the Project Cool logo is 50-pixels-wide.
img {width: 25%}
If you are using a CSS-enabled browser, the Project Cool logo is a quarter as wide as this browser window.