html,
      body {
        height: 100%;
        width: 100%;
        margin: 0;
        padding: 0;
      }
      body {
        display: table;
        background-color: white;
        color: black;
        font-family:
          "Optima", "Open Sans", "PT Sans", "Calibri", "Roboto", sans-serif;
        font-weight: 300;
        line-height: 1.3;
        text-rendering: optimizeLegibility;
      }
      a {
        color: #6080ff;
        text-decoration: none;
      }
      a:hover {
        text-decoration: underline;
      }
      a:visited {
        color: #8020a0;
      }
      header,
      .center,
      .tall,
      footer {
        display: table-row;
        width: 100%;
      }
      header {
        height: 32px;
      }
      .center {
        text-align: center;
      }
      .block {
        margin: 0 auto;
        padding: 0.5em 0.5em;
        max-width: 40em;
      }
      .info {
        margin: 0 auto;
        padding: 1.5em 2.5em 0.25em;
        max-width: 36em;
      }
      h1,
      h2,
      h3,
      h4 {
        margin: 0;
      }
      hr {
        height: 1px;
        background: #a0a0a0;
        border: 0;
        width: 40%;
        margin: 1.5em auto;
      }
      table {
        width: 100%;
      }
      td {
        margin: 0;
        padding: 0 0.5em;
      }
      ul {
        margin: 0 1.5em 1em;
        padding: 0;
      }
      p {
        margin: 0.25em 0 0.5em;
        padding: 0;
      }
      li {
        margin: 0.25em 0;
        padding: 0;
      }
      .tall {
        height: 100%;
      }
      footer {
        background-repeat: repeat-x;
      }
      img {
        vertical-align: middle;
      }
      @keyframes fade1 {
        0% {
          opacity: 1;
        }
        25% {
          opacity: 1;
        }
        35% {
          opacity: 0;
        }
        80% {
          opacity: 0;
        }
        90% {
          opacity: 1;
        }
      }
      @keyframes fade2 {
        0% {
          opacity: 0;
        }
        15% {
          opacity: 0;
        }
        25% {
          opacity: 1;
        }
        50% {
          opacity: 1;
        }
        60% {
          opacity: 0;
        }
      }
      @keyframes fade3 {
        0% {
          opacity: 0;
        }
        40% {
          opacity: 0;
        }
        50% {
          opacity: 1;
        }
        75% {
          opacity: 1;
        }
        85% {
          opacity: 0;
        }
      }
      @keyframes fade4 {
        0% {
          opacity: 0;
        }
        65% {
          opacity: 0;
        }
        75% {
          opacity: 1;
        }
        90% {
          opacity: 1;
        }
        100% {
          opacity: 0;
        }
      }
      .stack {
        position: absolute;
        animation-duration: 10s;
        animation-iteration-count: infinite;
      }
      .fade1 {
        opacity: 1;
        animation-name: fade1;
      }
      .fade2 {
        opacity: 0;
        animation-name: fade2;
      }
      .fade3 {
        opacity: 0;
        animation-name: fade3;
      }
      .fade4 {
        opacity: 0;
        animation-name: fade4;
      }
      .height_256 {
        width: 256px;
        height: 128px;
      }
      .height_128 {
        width: 256px;
        height: 64px;
      }
      .promo {
        width: 100px;
        height: 200px;
      }
      .icon {
        width: 100px;
        height: 100px;
      }
      footer {
        font-size: 1px;
        height: 16px;
        background-size: 418px 16px;
      }
      @media (min-width: 384px) {
        .height_256 {
          width: 384px;
          height: 192px;
        }
        .height_128 {
          width: 384px;
          height: 96px;
        }
        .promo {
          width: 150px;
          height: 300px;
        }
        .icon {
          width: 150px;
          height: 150px;
        }
        footer {
          height: 24px;
          background-size: 627px 24px;
        }
      }
      @media (min-width: 512px) {
        .height_256 {
          width: 512px;
          height: 256px;
          margin: 0 -40px;
        }
        .height_128 {
          width: 512px;
          height: 128px;
          margin: 0 -128px;
        }
        .promo {
          width: 200px;
          height: 400px;
        }
        .icon {
          width: 200px;
          height: 200px;
        }
        footer {
          height: 32px;
          background-size: 836px 32px;
        }
      }