Css in drupal

Drupal uses a CSS class called „clear-block” or „clearfx” that allows a container DIV to always enclose any floated children elements.

For instance, to add a node-blog.tpl.php template in a sub-theme, you must also copy over node.tpl.php from the parent theme. This bug has been fixed in Drupal 7 but will not be fixed in Drupal 6.