<div class="nyan-cat"></div>

.nyan-cat {
  position: relative;
  width: 82px;
  height: 82px;
  margin-top: 50px;
  animation: 4s linear 0s infinite move;
}

@keyframes move { 
  from { 
    margin-left: 0%; 
  }
  to { 
    margin-left: 80%; 
  }  
}

.nyan-cat::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  width: 2px;
  height: 2px;
  
  /* with help of https://itleadassist.io/ru/projects/css-pixel-generator */ 
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}