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HTML 

              
                <div class="triangleouter">
 <div class='wrap'>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
  <div class='tri'></div>
</div>
</div>
<h1 class="text-light">CSS Triangle Travelers</h1>
<p class="text-light">Originally by Nate Wiley</p>
!

CSS 

              
                html, body {
  height: 100%;
}

html {
  height: 100%;
  background-color: #090a0f;
  background: radial-gradient(ellipse at bottom, #1b2735, #090a0f);
  overflow: hidden;
}

body {
  background: transparent;
}


.triangleouter {
 position:absolute;
  top:0;
  left:0;
  z-index:-1;
  width:100vw;
  height:100vh;
}
.wrap {
  transform-style: preserve-3d;
  perspective: 800px;
   width:100vw;
  height:100vh;
}

.tri {
  height: 0;
  width: 0;
  position: absolute;
  top: 50%;
  left: 50%;
}

.tri:nth-child(1) {
  border-top: 26px solid #00eaff;
  border-right: 26px solid transparent;
  border-left: 26px solid transparent;
  margin-left: -13px;
  margin-top: -13px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(320deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim1 15s infinite linear;
  animation-delay: -1s;
  opacity: 0;
}

@keyframes anim1 {
  0% {
    opacity: 1;
    transform: rotate(480deg) translate3d(465px, 604px, 1000px) scale(1);
  }
}
.tri:nth-child(2) {
  border-top: 3px solid red;
  border-right: 3px solid transparent;
  border-left: 3px solid transparent;
  margin-left: -1.5px;
  margin-top: -1.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(359deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim2 15s infinite linear;
  animation-delay: -2s;
  opacity: 0;
}

@keyframes anim2 {
  0% {
    opacity: 1;
    transform: rotate(538.5deg) translate3d(82px, 296px, 1000px) scale(1);
  }
}
.tri:nth-child(3) {
  border-top: 25px solid #00ff59;
  border-right: 25px solid transparent;
  border-left: 25px solid transparent;
  margin-left: -12.5px;
  margin-top: -12.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(290deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim3 15s infinite linear;
  animation-delay: -3s;
  opacity: 0;
}

@keyframes anim3 {
  0% {
    opacity: 1;
    transform: rotate(435deg) translate3d(901px, 162px, 1000px) scale(1);
  }
}
.tri:nth-child(4) {
  border-top: 25px solid #5500ff;
  border-right: 25px solid transparent;
  border-left: 25px solid transparent;
  margin-left: -12.5px;
  margin-top: -12.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(298deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim4 15s infinite linear;
  animation-delay: -4s;
  opacity: 0;
}

@keyframes anim4 {
  0% {
    opacity: 1;
    transform: rotate(447deg) translate3d(454px, 309px, 1000px) scale(1);
  }
}
.tri:nth-child(5) {
  border-top: 34px solid #4d00ff;
  border-right: 34px solid transparent;
  border-left: 34px solid transparent;
  margin-left: -17px;
  margin-top: -17px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(258deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim5 15s infinite linear;
  animation-delay: -5s;
  opacity: 0;
}

@keyframes anim5 {
  0% {
    opacity: 1;
    transform: rotate(387deg) translate3d(715px, 517px, 1000px) scale(1);
  }
}
.tri:nth-child(6) {
  border-top: 41px solid #9dff00;
  border-right: 41px solid transparent;
  border-left: 41px solid transparent;
  margin-left: -20.5px;
  margin-top: -20.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(114deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim6 15s infinite linear;
  animation-delay: -6s;
  opacity: 0;
}

@keyframes anim6 {
  0% {
    opacity: 1;
    transform: rotate(171deg) translate3d(982px, 979px, 1000px) scale(1);
  }
}
.tri:nth-child(7) {
  border-top: 38px solid #00ffbb;
  border-right: 38px solid transparent;
  border-left: 38px solid transparent;
  margin-left: -19px;
  margin-top: -19px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(114deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim7 15s infinite linear;
  animation-delay: -7s;
  opacity: 0;
}

@keyframes anim7 {
  0% {
    opacity: 1;
    transform: rotate(171deg) translate3d(621px, 192px, 1000px) scale(1);
  }
}
.tri:nth-child(8) {
  border-top: 3px solid #0091ff;
  border-right: 3px solid transparent;
  border-left: 3px solid transparent;
  margin-left: -1.5px;
  margin-top: -1.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(314deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim8 15s infinite linear;
  animation-delay: -8s;
  opacity: 0;
}

@keyframes anim8 {
  0% {
    opacity: 1;
    transform: rotate(471deg) translate3d(712px, 81px, 1000px) scale(1);
  }
}
.tri:nth-child(9) {
  border-top: 18px solid #00ff95;
  border-right: 18px solid transparent;
  border-left: 18px solid transparent;
  margin-left: -9px;
  margin-top: -9px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(320deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim9 15s infinite linear;
  animation-delay: -9s;
  opacity: 0;
}

@keyframes anim9 {
  0% {
    opacity: 1;
    transform: rotate(480deg) translate3d(921px, 515px, 1000px) scale(1);
  }
}
.tri:nth-child(10) {
  border-top: 1px solid #ff0099;
  border-right: 1px solid transparent;
  border-left: 1px solid transparent;
  margin-left: -0.5px;
  margin-top: -0.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(295deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim10 15s infinite linear;
  animation-delay: -10s;
  opacity: 0;
}

@keyframes anim10 {
  0% {
    opacity: 1;
    transform: rotate(442.5deg) translate3d(142px, 332px, 1000px) scale(1);
  }
}
.tri:nth-child(11) {
  border-top: 2px solid #00ffa2;
  border-right: 2px solid transparent;
  border-left: 2px solid transparent;
  margin-left: -1px;
  margin-top: -1px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(201deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim11 15s infinite linear;
  animation-delay: -11s;
  opacity: 0;
}

@keyframes anim11 {
  0% {
    opacity: 1;
    transform: rotate(301.5deg) translate3d(712px, 614px, 1000px) scale(1);
  }
}
.tri:nth-child(12) {
  border-top: 13px solid #ff0037;
  border-right: 13px solid transparent;
  border-left: 13px solid transparent;
  margin-left: -6.5px;
  margin-top: -6.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(204deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim12 15s infinite linear;
  animation-delay: -12s;
  opacity: 0;
}

@keyframes anim12 {
  0% {
    opacity: 1;
    transform: rotate(306deg) translate3d(213px, 186px, 1000px) scale(1);
  }
}
.tri:nth-child(13) {
  border-top: 49px solid #a2ff00;
  border-right: 49px solid transparent;
  border-left: 49px solid transparent;
  margin-left: -24.5px;
  margin-top: -24.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(257deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim13 15s infinite linear;
  animation-delay: -13s;
  opacity: 0;
}

@keyframes anim13 {
  0% {
    opacity: 1;
    transform: rotate(385.5deg) translate3d(673px, 615px, 1000px) scale(1);
  }
}
.tri:nth-child(14) {
  border-top: 28px solid #ff8400;
  border-right: 28px solid transparent;
  border-left: 28px solid transparent;
  margin-left: -14px;
  margin-top: -14px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(61deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim14 15s infinite linear;
  animation-delay: -14s;
  opacity: 0;
}

@keyframes anim14 {
  0% {
    opacity: 1;
    transform: rotate(91.5deg) translate3d(956px, 15px, 1000px) scale(1);
  }
}
html.tritravelers .tri:nth-child(15) {
  border-top: 39px solid #1eff00;
  border-right: 39px solid transparent;
  border-left: 39px solid transparent;
  margin-left: -19.5px;
  margin-top: -19.5px;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
  transform: rotate(176deg) translate3d(0, 0, -1500px) scale(0);
  animation: anim15 15s infinite linear;
  animation-delay: -15s;
  opacity: 0;
}

@keyframes anim15 {
  0% {
    opacity: 1;
    transform: rotate(264deg) translate3d(157px, 189px, 1000px) scale(1);
  }
}
!

JS
!
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