.spec__box {
    border: 1px solid #ddd;
    margin-bottom: 10px;
    border-radius: 4px;
}
.spec__box .head {
    background: #f7f7f7;
    padding: 8px 12px;
    cursor: pointer;
    font-weight: bold;
}
.spec__body {
    display: none;
    padding: 10px;
}
.spec__box.open .spec__body {
    display: block;
}