.primary[data-contents-category="grade"]{
    float: none;
    width: auto;
}

.primary[data-contents-category="grade"] .hdg_l1_01.img img{
    width: 100%;
}
.btn_01_grade{
    display: inline-block;
    margin-top: 10px;
    text-align: center;
}
.btn_01_grade:before{
    display: none;
}
.btn_01_grade a{
    text-align: center;
    padding-right: 18px;
}
@media (max-width: 767px) {
    .btn_01_grade{
        display: flex;
        justify-content: center;
    }
    .btn_01_grade{
        margin-top: 20px;
        margin-bottom: 40px;
    }
}