#center {
position: absolute;
width: 990px;
margin-left: -495px;
padding-bottom: 50px;
left: 50%;
z-index: 1;
}

#error {
position: absolute;
width: 990px;
margin-top: -110px;
margin-left: -495px;
top: 50%;
left: 50%;
z-index: 1;
}

html {
overflow-y: scroll;
}