body {
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(../../images/grade-4th/bg.png);
    background-position: top center;
    background-size: cover;
    background-repeat: no-repeat;
    z-index: -1;
}

@media screen and (max-width: 768px) {
    body::before {
        background: url(../../images/grade-4th/bg_sp.png);
        background-size: cover;
        background-repeat: no-repeat;
    }
}

.header_main {
    box-shadow: 0 0 10px 0 #6dafdc;
}

.content_box {
    box-shadow: 0 0 10px 0 #6dafdc;
}

.header_sub {
    border-bottom: 10px solid #003686;
    background: #5db7e8;
}

@media screen and (max-width: 768px) {
    .header_sub {
        border-bottom: 1.5vw solid #003686;
    }
}

.title {
    background-color: #daedf9;
}

.title .lc-time {
    background-color: #ffffff;
}

.week-item {
    background-color: #008bd0;
}

.date-box .date {
    color: #008bd0;
}

.participate-button {
    background: linear-gradient(to bottom, #ffffff 40%, #daedf9 100%);
    border: 2px solid #008bd0;
}

.recorded-class-title-link {
    background-color: #003686;
    box-shadow: 0 3px 0 #001c2c;
}

.recorded-class-title-link:hover {
    box-shadow: 0 1px 0 #001c2c;
}

.recorded-class-item {
    background-color: #008bd0;
}

@media screen and (max-width: 768px) {
    .test-content-title-sub {
        background-color: #daedf9;
    }
}

.week-item.disabled .participate-button {
    background: #daedf9;
}

/* rec */

.toc_list {
    background-color: #003686;
}

.toc_list_1 li a.active, .toc_list_1 li a:hover {
    background-color: #003686;
}

.toc_list_1 li a {
    color: #003686;
}

.toc_list_2 li a {
    background-color: #daedf9;
}

.week-block {
    background-color: #008bd0;
}

.week-date {
    border: 3px solid #008bd0;
    color: #003686;
}

.back-to-top a {
    background-color: #003686;
}

.header_sub_title .icon-03 {
    width: 91px;
}

@media screen and (max-width: 1132px) {
    .header_sub_title .icon-03 {
        left: 5%;
    }
}

@media screen and (max-width: 768px) {
    .header_sub_title .icon-03 {
        width: 12.4vw;
        top: -34%;
    }
}

/* 春の色 */
body.spring .week-block {
    background-color: #5db7e9 !important;
}
body.spring .week-date {
    border: 3px solid #5db7e9 !important;
    color: #5db7e9 !important;
}
/* 秋の色 */
body.autumn .week-block {
    background-color: #008ad0 !important;
}
body.autumn .week-date {
    border: 3px solid #008ad0 !important;
    color: #008ad0 !important;
}
/* 冬の色 */
body.winter .week-block {
    background-color: #023686 !important;
}
body.winter .week-date {
    border: 3px solid #023686 !important;
    color: #023686 !important;
}