.container {
  min-height: 100vh;
  max-height: 100vh;
  position: relative;
  /*  border: 3px solid green;*/
}

.center {
  min-width: 100vw;
  max-width: 100vw;
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  /*-ms-transform: translate(-50%, -50%);*/
  transform: translate(-50%, -50%);
  /*  border: 3px solid blue;*/
  text-align: center;
  font-family: Verdana, sans-serif;
  font-size: 4vw;
}