Does anyone know why Opera doesn't use overflow:hidden?
Left is Opera, right is Firefox

CSS:
#ChatBig {
    width: 60%;
    height: 600px;
    margin: auto;
    background-color: white;
    overflow:hidden;
    resize:none;
    position: relative;
    border: 1px solid #000;
}
#ChatMessages{
    width: 100%;
    min-height: 498px;
    font-size: 16px;
    font-weight: normal;
    overflow:hidden;
    resize:none;
    position: absolute;
    bottom: 50px;
    margin-bottom: 10px;
}
#ChatText{
    width: 100%;
    height: 50px;
    border: 1px solid #000;
    overflow:hidden;
    resize:none;
    position: absolute;
    bottom: 0;
}
 
     
    