* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.contents {
    margin: auto;
    width: 100%;
    max-width: 980px;
}

.img {
    width: 100%;
    height: auto;
    max-width: 980px;
    max-height: 2121px;
}

.img-wrap {
    position: relative;
    display: inline-block;
    width: 100%;
}

.btn {
    border: none;
    display: flex;
    background: none;
    cursor: pointer;
    position: absolute;
    justify-content: center;
    align-items: center;
    right: calc(40 / 780* 100%);
    bottom: calc(68 / 1688* 100%);
    width: calc(300 / 780* 100%);
    height: calc(81 / 1688* 100%);
    min-width: 120px;
    min-height: 42px;
    max-width: 300px;
    max-height: 101px;
    text-indent: -9999px;
}