<!DOCTYPE HTML> <style> div { margin-top: 0; font-size: 12px; width: 450px } #center-block { height: 80%; } #center-col { background: yellow } #containing-block { height: -moz-calc(400px + 20px); } p { margin-top: 0px; } </style> <!-- Because the height of the containing block is constrained, the percent height should also be constrained, resulting in font inflation being disabled. --> <div id="containing-block"> <div id="center-block"> <div id="center-col"> <p>Life and death, dreaming and wakefulness: stations for the perplexed soul. It traverses them by stage, taking signs and hints from things, groping about in the sea of darkness, clinging stubbornly to a hope that smilingly and mysteriously renews itself. Traveler, what are you searching for? What emotions rage in your heart?</p> </div> </div> </div>