body {
    font: normal normal bold 20px Arial,'ｍｓ ｐゴシック','ms pgothic','돋움',dotum,helvetica,sans-serif;
    background-color: rgb(255, 212, 170);
}

#background-image {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-size: cover;
    background-position: center bottom;
    background-repeat: repeat;
    height: 100%;
    overflow-y: auto;
    background-image: url("https://static.wixstatic.com/media/874525150724b27ecb7c53aa6954e1d1.wix_mp/v1/fill/w_500,h_500,al_t/874525150724b27ecb7c53aa6954e1d1.wix_mp");
}

#main-content {
    border: solid 5px black;
    width: 870px;
    padding: 50px;
    top: 261.6px;
    left: 0;
    position: absolute;
    margin-left: calc((100% - 980px) / 2);
}

#main-content h1 {
    font-size: 28px;
}