html,
body {
    margin: 0px;
    padding: 0px;
    overflow: hidden;
    touch-action: none;
}

div#vieport {
    position: fixed;
    width: 100%;
    height: 100%;
}

div#vieport>canvas {
    display: block;
    width: 100%;
    height: 100%;
    border: none;
}

#overlay {
    position: absolute;
    left: 20%;
    top: 1%;
    width: 60%;
    z-index: 3;
    text-align: center;
}

.store-button {
    width: 20%;
    height: 6%;
    display: inline-block;
    vertical-align: top;
    box-sizing: border-box;
    border: 1px solid transparent;
    border-radius: 4px;
    background-color: #000;
    border-color: #a6a6a6;
}

.store-button:hover {
    background-color: #04421d;
    transition: background-color .2s ease, border .2s ease;
}