.grade_table_area{
    width: 90%;
    height: 95%;
    overflow-y: scroll;
}

.grade_table{
    width: 100%;
    max-height: 100%;
    border-collapse: collapse;
    table-layout: fixed;
    transition: 0.5s linear;
}

.grade_table > tbody > tr > th{
    position: sticky;
    top: -1px;
    color: #F1F6F9;
    font-weight: bold;
    font-size: 1.3rem;
    background-color: rgba(0, 0, 0, 1);
    padding: 15px;
    z-index: 1;
}

.grade_table > tbody > tr > td{
    color: #F1F6F9;
    font-weight: bold;
    font-size: 1.2rem;
    background-color: rgba(155, 164, 181, 0.5);
    padding: 15px;
    text-align: center;
    word-wrap: break-word;
}

.grade_table > tbody > tr:nth-child(even){
    background-color: rgba(155, 164, 181, 0.7);
}

.grade_table > tbody > tr:nth-child(odd):not(.th_title){
    background-color: rgba(33, 42, 62, 0.7)
}

.grade_table > tbody > tr > th:nth-child(1){
    width: 15%;
}

.grade_table > tbody > tr > td:nth-child(1){
    width: 15%;
}

.grade_table > tbody > tr > th:nth-child(3){
    width: 25%;
}

.grade_table > tbody > tr > td:nth-child(3){ 
    width: 25%;
}

@media only screen and (max-width: 768px) {
    .grade_chose_area{
        width: 100%;
    }

    .grade_table > tbody > tr > td:nth-child(2){
        line-height: 150%;
    }
}