#accordion_explanation h2 {
    font-size: 36px;
    font-weight: 700;
    color: #444444;
    text-align: center;
    margin: 50px 0px 30px;
}

/* topbar */
#accordion_explanation .topbar {
    position: relative;
    display: block;
    box-sizing: border-box;
    margin-bottom: 10px;
}

#accordion_explanation .topbar_center {
    position: relative;
    display: block;
    width: 80px;
    height: 12px;
    background-color: #db2300;
    margin: 0px auto;
    border-radius: 6px;
}

#accordion_explanation .topbar_left {
    position: absolute;
    display: none;
    top: 50%;
    left: 0%;
    width: calc(50% - 46px);
    height: 1px;
    background-color: #d3d3d3;
}

#accordion_explanation .topbar_right {
    position: absolute;
    display: none;
    top: 50%;
    right: 0%;
    width: calc(50% - 46px);
    height: 1px;
    background-color: #d3d3d3;
}

@media (max-width: 767px) {
    #accordion_explanation h2 {
        font-size: clamp(2vw, 1.6em, 5.8vw);
    }
}