html, body {
  width: 100%;
  height: 100%;
}

body {
  display: block;
}

body, div {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  vertical-align: baseline;
  background: transparent;
  overflow: hidden;
}

canvas{ 
  display: block;
  vertical-align: bottom;
}

#placeholder {
  width: 100vw;
  height: 100vh;
  background-color: #3b3b3b;
  background-image: url(../images/muxray.com.svg);
  background-repeat: no-repeat;
  background-size: 550px;
  background-position: 50% 50%