body {
  min-height: 100vh;
  min-width: 100vh;
  padding: 0;
}
.container {
  position: relative;
}

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