#bo_login {
    max-width: 500px;
    background-color: white;
    height: auto;
    margin: 0.5em 0.1em 0.1em 0.1em;
    padding: 1em 0.5em 0.5em 0.5em;
    border: solid 1px #cccccc;
    -moz-border-radius: 8px;
    -webkit-border-radius: 8px;
    -khtml-border-radius: 8px;
    border-radius: 8px;
    position: relative;
}

#bo_login,
#bo_login table,
#bo_login div {
    margin-left: auto;
    margin-right: auto;
}