body {
    width: 100%;
    margin: 0;
    overflow: hidden;
    padding: 0;
    background: hsla(0, 5%, 5%, 1);
}
h1 {
    text-align: center;
    text-shadow: 1px 2px 3px #666;
    color: white;
    font-family: fantasy;
    max-width: 100%;
    font-size: 3.9vw;
}
iframe, object, embed {
    max-width: 100%;
}
#youtube-video {
    display: block;
    margin-right: auto;
    margin-left: auto;
    padding-top: 30px;
}

#next {
    text-align: center;
    display: none;
}
#button {
    color: #9FF3E8;
    font-family: fantasy;
    font-weight: bolder;
    font-size: 18px;
    cursor: pointer;
}
@media only screen and (max-width: 320px) {
   body { font-size: 2em; }
}