body {
background-color:#000000;
}

div#login{
    position:fixed;
    top: 50%;
    left: 50%;
    width: 24em;
    height: 14em;
    margin-top: -7em; /*set to a negative number 1/2 of your height*/
    margin-left: -12em; /*set to a negative number 1/2 of your width*/
    border: 1px solid #ccc;
    background-color:#ffffff;
}

div#banner{
   position:fixed;
   width:100%;
   height:100px;
   background-color:#ffffff;
}


button#venue{
width:15%;
}

button#rsvp{
width:15%;
}

button#songs{
width:15%;
}

button#registry{
width:15%;
}

button#photos{
width:15%;
}