.container
  .border
    .content

body
  width 100%
  height 100%
  margin 0
  padding 0
  background #dfdfc3
  overflow hidden
  
  .container,
  .border
    width 20vh
    height 20vh
    background #292929
    position absolute
    top 50%
    left 50%
    overflow hidden
    transform translate( -50%, -50% )
    clip-path polygon(0% 50%, 25% 95%, 75% 95%, 100% 50%,  75% 5%, 25% 5% )
    clip-path polygon( 50% 0%, 95% 25%, 95% 75%, 50% 100%, 5% 75%, 5% 25%)
      
    .border
      width 90%
      height 90%
      
      .content
        width 150%
        height 100%
        background #dfdfc3
        position absolute
        top 50%
        left 50%
        animation contentAnimation 2s infinite linear
        transform-origin center top
      
@keyframes contentAnimation
  0%
    transform translateX( -50% ) rotate( 0deg )
  100%
    transform translateX( -50% ) rotate( -360deg )