alc(100% + 100px) calc(100% - 1px), -100px -100px;
        }
        55% {
          background-position: calc(100% + 100px) 1px,
            calc(100% - 1px) calc(100% + 100px), 100% calc(100% - 1px),
            -100px calc(100% + 100px);
        }
        80% {
          background-position: calc(100% + 100px) 1px,
            calc(100% - 1px) calc(100% + 100px), 0px calc(100% - 1px),
            1px calc(100% + 100px);
        }
        85% {
          background-position: calc(100% + 100px) 1px,
      