#field table  {
    border: 1px solid silver;
    border-collapse: collapse;
}

#field table td {
    border: 1px solid silver;
    width: 3.5em;
    height: 3.5em;
    text-align: center;
}

#field table td.black {
    background-color: silver;
}

#field table td span {
    font-size: 300%;
}

.figure {
    font-size: 300%;
}

.caption {
    color: silver;
}

#promotion_form {
    width: 20em;
    border: 1px solid silver;
    text-align: center;
    background-color: white;
    align: center;
    position: absolute;
    top: 25em;
    left: 50%;
    margin-left: -10em;
}

#promotion_form span {
    font-size: 300%;
    padding-left: 0.2em;
    cursor: pointer;
}