.indexPage {
    position: relative;
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, #101c29 0%, #0a1017 100%);
    overflow: hidden;
}

.indexPage::after {
    content: "";
    flex: 1 0 auto;
}

.main-t {
    position: relative;
    width: 100%;
    line-height: 0;
}

.main-image {
    display: block;
    width: 100%;
    height: auto;
}

.main-b {
    position: relative;
    z-index: 1;
    width: 100%;
    margin-top: -5vw;
    line-height: 0;
}

.main-b .main-image {
    -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 5vw, #000 calc(100% - 12vw), transparent 100%);
    mask-image: linear-gradient(to bottom, transparent 0, #000 5vw, #000 calc(100% - 12vw), transparent 100%);
}

.btn {
    position: absolute;
    top: 95%;
    left: 50%;
    width: 43%;
    transform: translate(-50%, -50%);
    z-index: 1;
}

.btn a,
.btn img {
    display: block;
    width: 100%;
    height: auto;
}