body { 
  margin: 0;
}

main { 
  display: flex;
  min-height: 90vh;
}

main > div { 
  width: 50%;
  float: left;
  position: relative;
}

main > div:first-of-type > * { 
  margin: 15px;
}

main:after {
  content: ' ';
  clear: both;
}

#sketch-container { 
  position: absolute; 
  bottom: 0;
  right: 0;
  background: #f1f1f1;
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

#sketch { 
  position: sticky;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  max-height: 100vh;
}

canvas {
  cursor: pointer; 
}

.canvas-msg { 
  position: absolute;
  top: 50%;
  left: 50%;
  width: 500px;
  max-width: 90%;
  text-align: center;
  transform: translate(-50%, -50%);
  font-size: 48px;
  line-height: 1.4;
  display: none;
  margin: 15px 0 0;
}

h2.canvas-msg { 
  font-size: 24px;
}

.canvas-top-msg { 
  top: 0;
  transform: translateX(-50%);
}