Question

Strangly enough, my website is rendering fine in Internet Explorer but fails in Mozilla based browsers.

Here is a screenshot:

Does anyone see why “right-panel” does not go all the way to the right? You can see how it is not lined up with the right edge of “top-panel”:

#container
{
    margin: 0 auto;
    width: 750px;
    background-color: #ffffff;
}

#top-panel
{
    padding-left: 10px;
    background-color: #000000;
    text-align: left;
    width: 100%;
    height: 88px;
}

#left-panel
{
     padding-top: 10px;
     text-align: center;
     background-color: #ffffff;
     border-right: 1px dashed #000000;
     float: left;
     width: 250px;
}

#right-panel
{
    background-color: #ffffff;
    float: right;
    width: 449px;
}

.clear
{
    clear:both;
    line-height:0;
}

If anyone wants to see the actual site it is: Math Relay

Answer 1

When you apply width:100% and use padding-left:10px also, it computes the width first, and then applies the padding, so actually your #top_panel CSS declaration is the problem. Try setting it to a fixed width for that.