SOURCE

<div class="loading">
  <span>
    LOADING
  </span>
  <div class="hex">
  </div>
  <div class="hex">
  </div>
  <div class="hex">
  </div>
  <div class="hex">
  </div>
  <div class="hex">
  </div>
  <div class="hex">
  </div>
  <div class="hex">
  </div>
</div>

html,
body {
  background: #222;
  box-shadow: inset 0 0 180px rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100%;
  background-image: url(https://unsplash.it/1000/500/?random);
  background-size: cover;
  background-position: center;
  background-color: red;
  background-blend-mode: multiply;
}

body:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: red;
  background-blend-mode: screen;
  opacity: 0.2;
}

.loading {
  width: 100px;
  height: 100px;
  position: fixed;
  top: 50%;
  left: 50%;
  margin: -50px 0 0 -50px;
  border-radius: 50%;
  animation: fadeIn 2s 1;
  -webkit-animation-fill-mode: forwards;
  * Safari 4.0 - 8.0 */ animation-fill-mode: forwards;
}

.loading span {
  color: #fff;
  display: block;
  top: 100%;
  position: absolute;
  font-size: 1.2em;
  width: 100%;
  font-family: 'Chathura', sans-serif;
  text-align: center;
  margin: 10px 0;
  letter-spacing: 0.3em;
}

.hex:nth-child(1) {
  top: 10px;
  left: 17px;
  animation-delay: 0.1s
}

.hex:nth-child(2) {
  top: 10px;
  left: 51px;
  animation-delay: 0.2s
}

.hex:nth-child(3) {
  top: 40px;
  left: 70px;
  animation-delay: 0.3s
}

.hex:nth-child(4) {
  top: 70px;
  left: 51px;
  animation-delay: 0.4s
}

.hex:nth-child(5) {
  top: 70px;
  left: 17px;
  animation-delay: 0.5s
}

.hex:nth-child(6) {
  top: 40px;
  left: 0;
  animation-delay: 0.6s
}

.hex:nth-child(7) {
  top: 40px;
  left: 35px;
  animation-delay: 0.7s
}

.hex:nth-child(8) {
  top: 10px;
  left: 17px;
  animation-delay: 0.1s
}

.hex {
  position: absolute;
  width: 30px;
  height: 20px;
  background-color: #fff;
  opacity: 0.2;
  animation: fade 1.5s infinite ease;
  box-shadow: 0 0 20px #fff, 0 0 20px #fff;
  opacity: 0.1;
}

.hex:before,
.hex:after {
  position: absolute;
  content: "";
  width: 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
}

.hex:before {
  border-bottom: 8px solid #fff;
  bottom: 100%;
}

.hex:after {
  width: 0;
  top: 100%;
  border-top: 8px solid #fff;
}

@keyframes fade {
  0% {
    opacity: 0.5;
    transform: scale(1);
  }
  7% {
    opacity: 0;
    transform: scale(0.2);
  }
  42% {
    opacity: 0;
    transform: scale(0.2);
  }
  49% {
    opacity: 0.5;
    transform: scale(1);
  }
  100% {
    opacity: 0.5;
    transform: scale(1);
  }
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}