html,
body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    overflow: hidden;
}

#startDemoButton {
    background: black;
    height: 60px;
    width: 160px;
    position: absolute;
    top: 50%;
    right: calc(50% - 80px);
    color: white;
    border-radius: 5px;
    border: none;
    outline: none;
    cursor: pointer;
    z-index: 1;
}

#startDemoButton:hover {
    background: grey;
}

#demoContainer {
    position: absolute;
    width: 85vw;
    height: 85%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
