html, body ,div {
  margin: 0;
  padding: 0;
  background-color: black;
}

canvas { position:block; top:0px; left:0px;}

.signature {
  animation: swing 0.97s linear infinite;
  float: right;
  font-size: 13px;
  height: 5%;
  margin-top: 15px;
}
.signature span {
  padding: 3px;
}
.signature1 {
  background: black;
  color: cyan;
}
.signature2 {
  background: #fff;
  color: red;
}
@-webkit-keyframes swing {
  0%,
  100% {
      transform: rotate(5deg);
  }
  50% {
      transform: rotate(-5deg);
  }
}