body 
{
    padding: 0;
    margin: 0;
    height: 100%;
    overflow:hidden;
}
#DVAberturaConteudo
{
    position: relative;
    height: 100%;   
        padding: 0;
    margin: 0;
}
#btnEntrarSite
{
    border: 1px solid #FF0000;
    background-color: #FFFFFF;
    color: #000000;
    padding: 10px;
}