#top_tutorial {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 200px;
    background: rgba(0, 0, 0, 0.6);
    z-index: 20005;
    text-align: center;
}

#bot_tutorial {
    position: fixed;
    top: 200px;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 20005;
}

#inner {
    display: inline-block;
    width: 300px;
    padding: 30px;
    border: 1px solid black;
    background: #e2d4da;
}

.mask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 20000;
    background: rgba(0, 0, 0, 0.6);
}