body {
    background: url("../img/pattern/p27.png") repeat #444;
}
.tac {
    text-align: center;
}
.signin {
    margin: 50px auto 0;
}

#logo {
    text-align: center;
    margin-bottom: 10px;
}
.signin {
    background: url("../img/pattern/p23.png") repeat;
    padding: 13px;
    border-radius: 4px;
}