#buttonx {
    position: absolute;
    height: 400px;
    width: 800px;
    border: 4px solid #B20000;
    background-color: #FF0000;
    color: #FFFFFF;
    box-shadow: 5px 5px 5px #888;
    text-align: center;
    border-radius: 6px;
    font-weight: bold;
    line-height: 35px;    
    margin: 0 auto;
}

#button a {
    text-decoration: none;
    color: #FFFFFF;
    font-size: 135%;
    position: relative;
}

#center {
    position: relative;
    max-width: 600px;
}