body {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #020408 50%, #03050a 100%), linear-gradient(to right, #020408 50%, #03050a 100%);
  margin: 0;
  padding: 0;
}

img {
  width: 100%;
  vertical-align: middle;
}

.box {
  position: relative;
}

.box1 {
  position: absolute;
  top: 3.6rem;
  left: 50%;
  transform: translateX(-50%);
  width: 5rem;
  height: 3rem;
}

.box2 {
  position: absolute;
  top: 7.4rem;
  left: 50%;
  transform: translateX(-50%);
  width: 5rem;
  height: 3rem;
}

.box3 {
  position: absolute;
  top: 11.2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 5rem;
  height: 3rem;
}

.box4 {
  position: absolute;
  top: 15.0rem;
  left: 50%;
  transform: translateX(-50%);
  width: 5rem;
  height: 3rem;
}


.loader {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

.loader>span {
  display: inline-block;
  background-color: #68e8ff;
  width: 0px;
  height: 0px;
  border-radius: 50%;
  margin: 0 8px;
  transform: translateY(0);
  animation: bounce 0.6s infinite alternate;
}

.loader>span:nth-child(2) {
  background-color: #253d81;
  animation-delay: 0.2s;
}

.loader>span:nth-child(3) {
  background-color: #68e8ff;
  animation-delay: 0.4s;
}

@keyframes bounce {
  to {
    width: 16px;
    height: 16px;
    transform: translateY(-16px);
  }
}

.main {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, .5);
  display: none;
}