.flex-center {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
}

.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #cdcdcd;
}

.dots .dot {
  display: inline-block;
  width: 35px;
  height: 35px;
  margin: 0 10px 0 10px;
  border-radius: 50%;
  background: #5baef2;
  -webkit-animation: dot-dot-dot 1.4s linear infinite;
  animation: dot-dot-dot 1.4s linear infinite;
}

.dots .dot:nth-child(2) {
  animation-delay: .2s;
}

.dots .dot:nth-child(3) {
  animation-delay: .4s;
}

@keyframes dot-dot-dot {
  0%, 60%, 100% {
    -webkit-transform: initial;
      -ms-transform: initial;
        transform: initial;
  }
  30% {
    -webkit-transform: translateY(-25px);
      -ms-transform: translateY(-25px);
        transform: translateY(-25px);
  }
}