html,
body {
    height: 100%;
    margin: 0;
}

body {
    display: grid;
    place-items: center;
}

#content {
    font-family: 'Noto Serif JP', sans-serif;
    line-height: 2.0;
    font-weight: 300;
    text-align: center;
    padding: 0 30px;
}

#content .spbr {
    display: none;
}

#content h1 {
    font-size: 40px;
    margin: 0 0 80px;
    font-weight: 300;
}

#content p {
    margin: 0 0 80px;
    font-size: 20px;
    font-weight: 300;
}

#content a {
    display: block;
    width: 500px;
    text-align: center;
    text-decoration: none;
    border: 1px solid #C0B173;
    padding: 12px;
    color: #000000;
    margin: 0 auto 100px;
    position: relative;
    font-size: 16px;
    ;
}

#content a::after {
    content: "";
    display: block;
    position: absolute;
    right: 22px;
    top: 50%;
    height: 6px;
    width: 24px;
    background-image: url(../img/arrow.png);
    background-position: center center;
    background-size: contain;
    transform: translateY(-50%);
}

#content img {
    max-width: 100%;
    height: 40px;
}

@media (max-width: 780px) {

    html,
    body {
        height: 100vh;
    }

    body {}

    #content {
        padding: 0 7.69vw;
    }

    #content .spbr {
        display: inline;
    }

    #content h1 {
        font-size: 6.15vw;
        margin: 0 0 7.69vw;
    }

    #content p {
        margin: 0 0 7.69vw;
        font-size: 3.33vw;
    }

    #content a {
        width: 82.05vw;
        padding: 3.08vw 0;
        margin: 0 auto 17.95vw;
        font-size: 4.1vw;
    }

    #content a::after {
        right: 4.36vw;
        height: 1.54vw;
        width: 6.15vw;
    }

    #content img {
        height: 7.69vw;
    }
}