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              <span> <!-- Square container -->
  <div></div> <!-- Bars -->
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</span>
            
          
!
            
              body { 
  background: rgb(20, 20, 20);
  overflow: hidden;
}
span {
  position: relative;
  display: block;
  width: 100%;
  height: 0;
  padding-top: 100%;
  overflow: hidden;
}
div {
  margin-top: -17%;
  height: 34%; 
  width: 2%;
  top: 30%;
  border-radius: 20px;
  position: absolute;
}
div:nth-of-type(1)  { animation: wave 17s   0.000s linear infinite; }
div:nth-of-type(2)  { animation: wave 17s -16.227s linear infinite; }
div:nth-of-type(3)  { animation: wave 17s -15.455s linear infinite; }
div:nth-of-type(4)  { animation: wave 17s -14.682s linear infinite; }
div:nth-of-type(5)  { animation: wave 17s -13.909s linear infinite; }
div:nth-of-type(6)  { animation: wave 17s -13.136s linear infinite; }
div:nth-of-type(7)  { animation: wave 17s -12.364s linear infinite; }
div:nth-of-type(8)  { animation: wave 17s -11.591s linear infinite; }
div:nth-of-type(9)  { animation: wave 17s -10.818s linear infinite; }
div:nth-of-type(10) { animation: wave 17s -10.045s linear infinite; }
div:nth-of-type(11) { animation: wave 17s  -9.273s linear infinite; }
div:nth-of-type(12) { animation: wave 17s  -8.500s linear infinite; }
div:nth-of-type(13) { animation: wave 17s  -7.727s linear infinite; }
div:nth-of-type(14) { animation: wave 17s  -6.955s linear infinite; }
div:nth-of-type(15) { animation: wave 17s  -6.182s linear infinite; }
div:nth-of-type(16) { animation: wave 17s  -5.409s linear infinite; }
div:nth-of-type(17) { animation: wave 17s  -4.636s linear infinite; }
div:nth-of-type(18) { animation: wave 17s  -3.864s linear infinite; }
div:nth-of-type(19) { animation: wave 17s  -3.091s linear infinite; }
div:nth-of-type(20) { animation: wave 17s  -2.318s linear infinite; }
div:nth-of-type(21) { animation: wave 17s  -1.545s linear infinite; }
div:nth-of-type(22) { animation: wave 17s  -0.773s linear infinite; }

@keyframes wave {
  0%   { left:-2%; background: #3B44D1; }
  5%   { background: #9337FE; }
  10%  { height:10%; margin-top: -5%; background: #C532FC; }
  15%  { background: #F639F8; }
  20%  { height:34%; margin-top:-17%; background: #F236C8; }
  25%  { background: #FF2F8D; }
  30%  { height:10%; margin-top: -5%; background: #EE3860; }
  35%  { background: #DC5245; }
  40%  { height:34%; margin-top:-17%; background: #F38643; }
  45%  { background: #F8B435; }
  50%  { height:10%; margin-top: -5%; background: #FAF444; }
  55%  { background: #E0FF3B; }
  60%  { height:34%; margin-top:-17%; background: #E1FF3C; }
  65%  { background: #46F443; }
  70%  { height:10%; margin-top: -5%; background: #54E67B; }
  75%  { background: #4DF3A9; }
  80%  { height:34%; margin-top:-17%; background: #3AF9DA; }
  85%  { background: #36EBF4; }
  90%  { height:10%; margin-top: -5%; background: #3DB3F3; }
  95%  { background: #3C82F1; }
  100% { height:34%; margin-top:-17%; left:100%; background: #5B38EE; }
}
            
          
!
999px
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