.doc {
    position: relative;
    overflow: hidden;
}

.doc-innner {
    text-align: center;
    padding: 80px 0 10px 0;
}

.doc.doc-right {
    background: url('../../images/bottom-right.png') no-repeat center 0 #f5f5f5;
    background-size: 100% auto;
}

.doc.doc-left {
    background: url('../../images/top-left.png') no-repeat center 0 #f5f5f5;
    background-size: 100% auto;
}

.doc-innner .doc-title {
    font-size: 54px;
    line-height: 64px;
    padding-bottom: 26px;
}

.doc-innner .doc-desc {
    font-size: 18px;
    color: #666;
}

.doc-bg {
    min-height: 540px;
}

.doc-bg img {
    position: absolute;
    bottom: -120px;
    margin: 0 auto;
    left: 50%;
    transform: translateX(-50%);
    display: block;
    height: 610px;
}

.doc-bg img.show {
    animation: isShow .7s ease-in-out forwards;
}

@keyframes isShow {
    0% {
        bottom: -120px;
    }

    25% {
        bottom: -100px;
    }

    50% {
        bottom: -90px;
    }

    75%,
    100% {
        bottom: -85px;
    }
}