body.sp_device {
    overflow: hidden;
    overscroll-behavior: none;
}
.canvasarea__wrap {
    position: relative;
    height: 100%;
    background-size: 100% 100%;
    background-size: cover;
    background-position: center;
    width: 100%;
    height: 100vh;
    margin-bottom: 42000px;
    opacity: 0;
    /* 最初は白から */
    transition: opacity 0.3s ease-out;
}
body.sp_device .canvasarea__wrap {
    margin-bottom: 42000px;
}
.canvasarea__wrap.show {
    opacity: 1;
}
.canvasarea {
    width: 100%;
    height: 100%;
    transition: opacity 0.6s ease-out;
    display: block;
    user-select: none;
    position: fixed;
    overflow: visible;
    margin-left: auto;
    margin-right: auto;
}
.canvasarea canvas {
    width: 100% !important;
    height: 100% !important;
    user-select: none;
}
.canvasarea__wrap.show canvas {
    pointer-events: auto;
}
.canvasarea canvas.mouse_over {
    cursor: pointer;
}
.canvasarea canvas.show {
    opacity: 1;
}
.size-guide {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    pointer-events: none;
}
header {
    pointer-events: none;
    position: fixed;
}
.canvas__messagearea {
    position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    pointer-events: none;
    display: grid;
    place-items: center;
    user-select: none;
    color: #fff;
}
.canvas__messagearea .start-icon {
    width: 12%;
    pointer-events: none;
    transition: opacity 1.2s ease-out 0.5s, transform 1.2s ease-in;
    opacity: 0;
    grid-area: 1/1;
}
.canvas__messagearea .start-message {
    height: 70%;
    opacity: 0;
    transition: opacity 1.2s ease-out;
    grid-area: 1/1;
    aspect-ratio: 42/420;
}
.canvas__messagearea .start-icon.show {
    opacity: 1;
}
.canvas__messagearea .start-icon.show.hide {
    opacity: 0;
    transform: scale(4);
}
.canvas__messagearea .start-message.show {
    opacity: 1;
}
.canvas__messagearea .start-message__text {
    width: auto;
    height: 100%;
}
.under-content {
    opacity: 0
}
.under-content.show {
    opacity: 1;
}
.under-content .test_btn {
    font-size: 2rem;
    color: #f00;
    pointer-events: auto;
}
.description-content {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    overflow: scroll;
    padding-top: 100vh;
    pointer-events: none;
    /*スクロールバー非表示（IE・Edge）*/
    -ms-overflow-style: none;
    /*スクロールバー非表示（Firefox）*/
    scrollbar-width: none;
}
.description-content::-webkit-scrollbar {
    display: none;
}
.description-content.hide {
    display: none;
}
.description-wrap {
    max-width: 1200px;
    margin: 0 auto;
    max-width: 1200px;
    margin: 0 auto;
    padding: 5rem;
    padding-bottom: 100vh;
}
.description-wrap .h1{
    text-align: center;
    margin-bottom: 1rem;
    font-size: 1.75rem;
}
.description__box {
    margin-bottom: 6rem;
    font-size: 1.125rem;

}
.description__box p{
    text-align: left;
    line-height: 2;
}
#skip-btn {
    position: fixed;
    z-index: 100;
    bottom: 1rem;
    right: 1rem;
    width: 4rem;
    height: 4rem;
    border-radius: 2rem;
    background: #999;
    color: #fff;
    text-align: center;
    padding-top: 0.75rem;
    line-height: 2.6rem;
    pointer-events: auto;
    transition:opacity .4s;
}
#skip-btn:hover {
    cursor: pointer;
}
.under-content.on ~ #skip-btn{
    opacity:0;
}
@media screen and (max-aspect-ratio:1/1) {
    .canvas__messagearea .start-icon {
        width: 40%;
    }
    .canvas__messagearea .start-message {
        height: 50%;
    }
    #skip-btn {
        width: 8rem;
        height: 8rem;
        border-radius: 4rem;
        font-size: 2em;
        line-height: 3.1em;
    }
}
@media screen and (max-width:767px) {
    .description-wrap {
        padding: 2rem;
        padding-bottom: 100vh;
    }
    .description-wrap h1{
        margin-bottom: 1rem;
        font-size: 1.6rem;
    }
    .description__box {
        margin-bottom: 6rem;
        font-size: 1.1rem;
    }
    #skip-btn {
        width: 4rem;
        height: 4rem;
        font-size: 1em;
        line-height: 2.5em;
        bottom: 2rem;
        right: 4rem;
    }
}