/* body {

  overflow-y: hidden;
} */
canvas {
    overflow-y: hidden;
  display: block;
  position: relative;
  margin: auto;
  -webkit-mask-image: -webkit-gradient(linear, left 0%, left bottom, from(rgba(0, 0, 0, 0)), to(#000000));
} 
.smoke {
  position: relative;
  margin: auto;
}
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  text-align: center;
  line-height: 40vh;
  font-family: sans-serif;
  color: #000000;
}