.rifa-wrapper {
    background: #111;
    color: #fff;
    padding: 20px;
    font-family: sans-serif;
    max-width: 500px;
    margin: auto;
    text-align: center;
}
.numero {
    display: inline-block;
    width: 30px;
    height: 30px;
    margin: 3px;
    background: #333;
    color: #fff;
    line-height: 30px;
    cursor: pointer;
    border-radius: 5px;
}
.numero.selecionado {
    background: red;
}
.numero.ocupado {
    background: gray;
    cursor: not-allowed;
}
.confirmado {
    margin-top: 10px;
    background: green;
    padding: 10px;
}
.rifa-logo {
    width: 100px;
    margin-bottom: 10px;
}
.rifa-regras {
    margin-top: 20px;
    font-size: 0.9em;
    color: #aaa;
}