style.css

@import url('https://fonts.googleapis.com/css?family=Raleway&display=swap');

html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-family: 'Raleway';
  user-select: none;
  cursor: grab;
  color: rgba(255, 255, 255, 0.4);
}
canvas {
  display: block;
}
:active{
  cursor: grabbing;
}

/*------------ Texts --------------*/  
.title {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.2em;
  font-weight: bold;
}

.by {
  font-size: 0.8em;
}
.helper{
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  font-weight: bold;
}
.hint {
  position: absolute;
  bottom: 5%;
  left: 50%;
  transform: translateX(-50%);
  font-weight: bold;
  color: rgba(255, 255, 255, 0.5);
}
.classify {
  margin: 1em;
  font-size: 0.8em;
}
.current{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 10em;
}

/*------------ Others --------------*/  
.hide{
  display: none;
}

.prediction{
  width: 30px;
  height: 30px;
  font-size: 1.2em;
  font-weight: bold;
  line-height: 30px;
  text-align: center;
  cursor: none;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  color: white;
}