body {
  overflow: hidden;
  background-color: hsl(238, 39%, 5%);
}

#canvas1 {
  padding: 0;
  margin: auto;
  display: block;
  width: 800px;
  height: 80px;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}