/* HTML: <div class="loader"></div> */
.loader {
  width: 120px;
  height: 20px;
  background: linear-gradient(#000 50%,#0000 0),
    linear-gradient(#0000 50%,#000 0),
    linear-gradient(#000 50%,#0000 0),
    linear-gradient(#0000 50%,#000 0),
    linear-gradient(#000 50%,#0000 0),
    linear-gradient(#0000 50%,#000 0)
    #ddd;
  background-size: calc(100%/6 + 1px) 200%;
  background-repeat: no-repeat;
  animation: l12 2s infinite;
}

@keyframes l12 {
  0% {
    background-position: calc(0*100%/5) 100%,calc(1*100%/5)   0%,calc(2*100%/5) 100%,calc(3*100%/5)   0%,calc(4*100%/5) 100%,calc(5*100%/5)   0%
  }

  16.67% {
    background-position: calc(0*100%/5)   0%,calc(1*100%/5)   0%,calc(2*100%/5) 100%,calc(3*100%/5)   0%,calc(4*100%/5) 100%,calc(5*100%/5)   0%
  }

  33.33% {
    background-position: calc(0*100%/5)   0%,calc(1*100%/5) 100%,calc(2*100%/5) 100%,calc(3*100%/5)   0%,calc(4*100%/5) 100%,calc(5*100%/5)   0%
  }

  50% {
    background-position: calc(0*100%/5)   0%,calc(1*100%/5) 100%,calc(2*100%/5)   0%,calc(3*100%/5)   0%,calc(4*100%/5) 100%,calc(5*100%/5)   0%
  }

  66.67% {
    background-position: calc(0*100%/5)   0%,calc(1*100%/5) 100%,calc(2*100%/5)   0%,calc(3*100%/5) 100%,calc(4*100%/5) 100%,calc(5*100%/5)   0%
  }

  83.33% {
    background-position: calc(0*100%/5)   0%,calc(1*100%/5) 100%,calc(2*100%/5)   0%,calc(3*100%/5) 100%,calc(4*100%/5)   0%,calc(5*100%/5)   0%
  }

  100% {
    background-position: calc(0*100%/5)   0%,calc(1*100%/5) 100%,calc(2*100%/5)   0%,calc(3*100%/5) 100%,calc(4*100%/5)   0%,calc(5*100%/5) 100%
  }
}