body {
    background: linear-gradient(#000, #151515);
  }
  
  canvas {
    display: block;  
  }
.header {
  position: fixed; /* or absolute */
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1em;
  color: #fff;
  font-family: "Century Gothic", CenturyGothic, Geneva, AppleGothic, sans-serif;
}
.footer {
  font-size: 1em;
  color: #fff;
  font-family: "Century Gothic", CenturyGothic, Geneva, AppleGothic, sans-serif;
}