.about {
    padding-bottom: 150px;
}
.model-title {
    background-position: center;
    background-repeat: no-repeat;
    background-size: auto;
    background-image: url(../images/mode-title_01.png);
    padding-top: 50px;
    padding-bottom: 50px;
    text-align: center;
}

.model-title.ys {
    background-image: url(../images/mode-title_15.png);
}

.model-title h2 {
    margin: 0;
    font-size: 48px;
    font-weight: bold;
    color: #0690b4;
}

.interface {
    background-color: #d3eef5;
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;
    position: relative;
    overflow: hidden;
    margin-top: 50px;
}

.interface::before {
    display: block;
    content: '';
    background-color: #0690b4;
    width: 6px;
    top: 0;
    bottom: 0;
    left: 0;
    position: absolute;
    z-index: 0;
}

.interface h4 {
    font-weight: bold;
    color: #0690b4;
    display: inline-block;
    margin-left: 80px;
    margin-right: 100px;
    line-height: 2;
}

.interface span {
    color: #0690b4;
}

.mb40 {
    margin-bottom: 40px;
}

.flex {
    flex-wrap: wrap;
}

.flex .adv-item {
    width: 50%;
    padding: 50px;
}

.flex .adv-item:nth-child(odd) {
    border-right: 1px solid #c1c1c1;
}

.flex .adv-item:nth-child(1),
.flex .adv-item:nth-child(2) {
    border-bottom: 1px solid #c1c1c1;
}