main.css

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
}

* {
  box-sizing: border-box;
}


.img-container {
  display: flex;
  height: 100%;
  width: 100%;
  max-width: 100%;
  position: relative;
}

.canvas {
  width: auto;
  max-height: 100%;
  max-width: 100%;
  display: block;
  margin: auto;
}

.loading-screen {
  position: absolute;
  width: 100%;
  height: 100%;
  background: white;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 40px;
  transition: .25s ease all .75s;
  color: #999;
  transform: translateZ(50px);
}

.loading-screen.hidden {
  visibility: hidden;
  opacity: 0;
}