One of my fellow tried to make a XHTML/CSS document but they got few errors , the errors was floating issue when we float a document using CSS we must have to clear them at end if we do not clear them they will be floating and the container of those floating tags will not be streched till end, and why sidebar is not coming to right place these problems can be arise for new people who try to make XHTML/CSS document please watch the video carefully how to get rid from these problems. How to use firebug in Firefox so you can solve little and big bugs in your XHTML/CSS i assure you after watching this video you will able to clear floating points, and solving alignment problems of your documents if you have any question please post a comment.