#index_background {
    width: 100%;
    height: calc(100vh - 100px);
    background: url(../pic/index/index_img.png);
    background-size: cover;
    display: inline-block;
    background-position: center;
}

#catch_copy {
    width: 4rem;
    position: absolute;
    top: 10rem;
    right: 0;
    left: 0;
    margin: auto;
    box-shadow: 0 10px 25px 0 rgba(0, 0, 0, .2);
    z-index: 30;
}

#catch_copy img {
    width: 4rem;
}

.index_img {
    width: 100%;
}

.index_img img {
    width: 100%;
    display: block;
}