body{
  background-color: #1D1D1B;
  color: white;
  font-size: 30px;  
}

.container{
  /*background-color: #696969;*/
  width: 600px;
  min-height: 600px;
  padding: 15px;
  display: flex;
  justify-content: center;
  align-items: center;
  
  /* position the div in center */
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}