d, set progress to 100% and then fade out the
       progress bar.
    */
    .loading-bar.is-done {
      animation: loading-bar-finish;
      animation-duration: 1s;
      animation-fill-mode: forwards;
    }

    @keyframes loading-bar-finish {
      /* Same as end state of `loading-bar-begin` animation */
      0% {
        width: 20%;
        opacity: 1.0;
      }

      20% {
        width: 100%;
        opacity: 1.0;
      }

      70% {
        width: 100%;
        opacity: 0.0;
      }

      100% 