.grammar {
  background: rgba(204, 204, 204, 0.0);
  position: fixed;
  top: 11%;
  left: 0;
  right: 10px;
  height: 0;
  z-index: 0;
}

textarea {
  border: 3px solid #cccccc;
  padding: 5px;
  font-family: Tahoma, sans-serif;
  background-position: bottom right;
  background-repeat: no-repeat;
  opacity: 0.2;
  transition: opacity .5s ease-out;
  -moz-transition: opacity .5s ease-out;
  -webkit-transition: opacity .5s ease-out;
  -o-transition: opacity .5s ease-out;
}

textarea:hover {
  border: 3px solid #cccccc;
  padding: 5px;
  font-family: Tahoma, sans-serif;
  background-position: bottom right;
  background-repeat: no-repeat;
  opacity: 1.0;
  transition: opacity .5s ease-out;
  -moz-transition: opacity .5s ease-out;
  -webkit-transition: opacity .5s ease-out;
  -o-transition: opacity .5s ease-out;
}

html, body {
  margin: 0;
  overflow: hidden;
}
canvas {
  width: 100%;
  height: 100%;
}