#wrap {
    display: flex;flex-direction: column;justify-content: center;align-items: center;
    background-color: #634ace;
    min-height: 100vh;
}
#wrap img {
    display: block;
    width: 55%;max-width: 360px;
    margin-bottom: 10rem;
}
#wrap .index_btn {
    display: flex;justify-content: center;align-items: center;
    background-color: #fc6870;color: #fff;
    box-shadow: 0 0 1rem rgba(0, 0, 0, .1);
    width: 90%;height: 4.5rem;
    max-width: 400px;
    font-size: 1.8rem;
    font-weight: 600;
    border-radius: .3rem;
}