.box {
  height: 100vh;
}

.container {
  height: 100%;
  background: #fff;
  position: relative;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.btn {
  background: #fff;
  border: 1px solid #000;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s ease;
}
.btn:active {
  background-color: #3cb8d5;
}
.btn:hover {
  background-color: #3cb8d5;
}

.back {
  margin: 30px;
  background: #000;
  color: #fff;
}

/* Loading css */
.lds-facebook {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
}
.lds-facebook div {
  display: inline-block;
  position: absolute;
  left: 8px;
  width: 16px;
  background: #000;
  animation: lds-facebook 1.2s cubic-bezier(0, 0.5, 0.5, 1) infinite;
}
.lds-facebook div:nth-child(1) {
  left: 8px;
  animation-delay: -0.24s;
}
.lds-facebook div:nth-child(2) {
  left: 32px;
  animation-delay: -0.12s;
}
.lds-facebook div:nth-child(3) {
  left: 56px;
  animation-delay: 0;
}
@keyframes lds-facebook {
  0% {
    top: 8px;
    height: 64px;
  }
  50%,
  100% {
    top: 24px;
    height: 32px;
  }
}
