body,
html {
  margin: 0;
  height: 100%;
  background: #ffffff;
  background-size: 100% 100%;
}

.center {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.contain {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.stretch {
  display: block;
  width: 100%;
  height: 100%;
}

.cover {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (prefers-color-scheme: dark) {
  body {
    margin: 0;
    height: 100%;
    background: #000000;
    background-image: url("img/dark-background.png");
    background-size: 100% 100%;
  }
}