#app-container {
  width: 1200px;
  height: calc(100% - 100px);
  max-height: 1000px;
  top: 50%;
  left: 50%;
  position: absolute;
  transform: translate3d(-50%, -50%, 0);
  background: #4a90e2;
  box-shadow: 0px 2px 2px 0px rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  font-family: Helvetica, "roboto";
}

.center-box {
  text-align: center;
  top: 50%;
  left: 50%;
  position: absolute;
  transform: translate(-50%, -50%);
}

.center-box.alert {
  font-size: 20px;
}