html, body {
  margin: 0;
  padding: 0;
}
canvas {
  display: block;
}
h1 {
    text-align:center;
}
#play {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    text-align: center;
    font-size: 16px;
    cursor: pointer;
    border-radius: 4px;
    position:absolute;
    transform: translateX(-50%);
    transform: translateY(-50%);
    left:45%;
    top:20%;
}
#pause {
    background-color: #AF4C50;
    color: white;
    padding: 10px 20px;
    border: none;
    text-align: center;
    font-size: 16px;
    cursor: pointer;
    border-radius: 4px;
    position:absolute;
    transform: translateX(-50%);
    transform: translateY(-50%);
    left:55%;
    top:20%;
}