body {
    background-color:lightgrey;
    font-family:Arial, Helvetica, sans-serif;
    margin:25px;
}
tr {
    width:400px;
}
a:link {
    color:darkblue;
}
.center {
    margin:auto;
    width:400px;
}
.rings {
    width:400px;
    background-color:white;
    color:white;
    border:thin solid black;
}
.ring_blank {
    width:400px;
    background-color:white;
    color:white;
    text-align:center;
}
.ring_first {
    width:50px;
    background-color:grey;
    text-align:center;
}
.ring_second {
    width:100px;
    background-color:grey;
    text-align:center;
}
.ring_third {
    width:200px;
    background-color:grey;
    text-align:center;
}
.ring_fourth {
    width:300px;
    background-color:grey;
    text-align:center;
}