#about_cover, #view, #view canvas, body, html {
    height: 100%;
    width: 100%
}

#about, #about_cover, #bt_fs, #ng, .ok {
    display: none
}

#about a, #bt_about a, #bt_backtrack a, #bt_feedback a, #bt_start a {
    color: #fff;
    text-decoration: none;
    border-bottom: dashed 1px #fff
}

body, html {
    position: absolute;
    overflow: hidden;
    text-align: center;
    background: #8cc;
    color: #fff;
    font-family: initial, sans-serif
}

#about_cover, #view {
    position: fixed;
    top: 0;
    z-index: 1
}

#bt_back, #bt_fs {
    position: absolute;
    z-index: 100;
    padding: 10px;
    left: 0;
    font-size: 20px;
    cursor: pointer;
    transition: .2s ease
}

#bt_fs {
    left: auto;
    right: 0
}

#scene_main, #scene_top {
    width: 90%
}

#scene_loading {
    width: 100%
}

#about, #scene_loading, #scene_main, #scene_top {
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    z-index: 100;
    display: none
}

#scene_top h1 {
    font-size: 20px;
    margin-bottom: 25px
}

#bt_start {
    margin-bottom: 15px
}

#scene_top .attention {
    font-size: 20px;
    margin-top: 25px
}

#scene_top .tit {
    margin-top: 20px;
    margin-bottom: 10px
}

#scene_top .con {
    letter-spacing: -.5rem
}

#scene_top .sns {
    margin: 0 8px;
    cursor: pointer
}

#scene_top .sns img {
    width: 40px
}

#ng .atten {
    font-size: 20px;
    margin-bottom: 20px
}

#scene_loading hr {
    width: 0
}

#scene_main, #scene_main .attention {
    pointer-events: none
}

#bt_backtrack, #bt_feedback {
    font-size: 20px;
    margin-top: 20px;
    pointer-events: auto
}

#about_cover {
    z-index: 900;
    background: #fff;
    opacity: .5
}

#about {
    z-index: 1000;
    color: #fff;
    background: #8cc;
    max-width: 640px;
    letter-spacing: .2rem;
    line-height: 1.2;
    width: 100%
}

#about_in {
    padding: 40px
}

#bt_close {
    font-size: 20px;
    cursor: pointer
}

#about .close {
    margin-bottom: 30px
}

#about .con {
    line-height: 1.7;
    margin-bottom: 20px
}

#about .link {
    margin-top: 30px;
    margin-bottom: 10px;
    line-height: 1.5
}

#bt_back:hover, #bt_backtrack:hover, #bt_close:hover, #bt_feedback:hover, #bt_fs:hover, #scene_top .sns:hover, a:hover {
    -webkit-animation: animover .2s linear;
    animation: animover .2s linear
}

@keyframes animover {
    0.00% {
        opacity: 0
    }
    100% {
        opacity: 1
    }
}

@-webkit-keyframes animover {
    0.00% {
        opacity: 0
    }
    100% {
        opacity: 1
    }
}

@media (max-width: 640px) {
    #scene_top h1 {
        font-size: 20px;
        margin-bottom: 18px
    }

    #bt_start, #scene_top .tit {
        margin-bottom: 10px
    }

    #bt_about a, #bt_start a {
        font-size: 20px
    }

    #scene_top .attention {
        font-size: 20px;
        margin-top: 18px
    }

    #scene_top .tit {
        font-size: 20px;
        margin-top: 20px
    }

    #scene_top .con {
        letter-spacing: -.5rem
    }

    #scene_top .sns {
        margin: 0 8px
    }

    #scene_top .sns img {
        width: 30px
    }

    #ng .atten {
        font-size: 20px;
        margin-bottom: 15px
    }

    #bt_backtrack, #bt_feedback {
        font-size: 20px
    }

    #about_in {
        padding: 30px
    }

    #bt_close {
        font-size: 20px;
        cursor: pointer
    }

    #about {
        letter-spacing: .1rem
    }

    #about a {
        color: #fff;
        text-decoration: none;
        border-bottom: dashed 1px #fff
    }

    #about .con, #about .link {
        font-size: 20px
    }
}