body {
  margin: 0;
  height: 100%;
  background: url("img/dark-background.png") no-repeat center center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.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;
}

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

.bottomLeft {
  position: absolute;
  bottom: 0;
  left: 0;
}

.bottomRight {
  position: absolute;
  bottom: 0;
  right: 0;
}

@media (prefers-color-scheme: dark) {
  body {
    margin: 0;
    height: 100%;
    background: url("img/dark-background.png") no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
  }
}