width property in div not working correctly.

Sorry, reposting code as previous post did not post properly:

#content_area {
position: relative;
float: left;
background-color: #ffffff;
padding-bottom: 2000px;
margin-bottom: -2000px;
width: 100%; /*this is not using 100% of screen between left and right columns */
}
#right_side {
position: relative;
float: left;
width: 200px;
background-color: #52f471;
margin-right: -200px;
margin-bottom: -2000px;
padding-bottom: 2000px;
}
#left_side {
position: relative;
float: left;
width: 200px;
background-color: #52f471;
right: 200px;
margin-left: -100%;
margin-bottom: -2000px;
padding-bottom: 2000px;
}

//mod edit: When adding to or correcting a post, please reply to the original post instead of starting a new topic. I copied the missing css to the OP. This topic closed ~gt