.course-on {
    height: 35px;
    line-height: 35px;
    border-radius: 10px 0px 10px 0px;
    background-color: #ebebeb;
    font-size: 16px;
    cursor: pointer;
}

.course-off {
    height: 35px;
    line-height: 35px;
    font-size: 16px;
    cursor: pointer;
}

.course-box {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    row-gap: 10px;
    column-gap: 10px;
}

.course-tb {
    padding: 0px 10px;
}