body {
  display: grid;
  font-family: "Nelvetica Neue", Helvetica, sans-serif;
  font-weight: 300;
  font-size: 15px;
  margin: 0;
  grid-template-columns: auto 980px auto;
  grid-template-rows: 6rem calc(100vh - 13rem) auto;
  grid-template-areas: ". header ." ". main ." ". footer ."; }
  body header {
    grid-area: header;
    padding-top: 3rem; }
    body header nav {
      display: flex;
      justify-content: space-between; }
      body header nav button {
        flex-grow: 0;
        flex-shrink: 0;
        position: relative;
        width: 3rem;
        height: 3rem;
        background-color: #1cafab;
        border: none;
        border-radius: 4px;
        outline: none;
        box-shadow: none;
        color: #fff;
        font-size: 2rem;
        font-weight: 300; }
        body header nav button:before {
          content: attr(data-left);
          display: block;
          font-size: 1rem;
          width: 3rem;
          height: 1.25rem;
          line-height: 1.25rem;
          position: absolute;
          top: -1.25rem;
          left: 0;
          padding-bottom: 4px;
          z-index: -1;
          background: #226677;
          border-radius: 4px; }
        body header nav button[data-left="2"]:before {
          background: #ff9c32; }
        body header nav button[data-left="1"]:before {
          background: #ee2f4a; }
        body header nav button[data-left="0"] {
          background: #aaa; }
          body header nav button[data-left="0"]:before {
            background: #777; }
  body main {
    grid-area: main;
    background: #eee;
    border-radius: 8px;
    padding: 1rem;
    box-sizing: border-box;
    margin-top: 2rem;
    overflow-y: scroll; }
    body main #chain {
      margin-top: 0.25rem;
      padding: 0.5rem;
      border-radius: 6px;
      background: #1cafab;
      color: white;
      font-weight: 500;
      text-align: center;
      box-shadow: inset 0px 3px 14px rgba(0, 0, 0, 0.75);
      text-shadow: 0px 3px 14px rgba(0, 0, 0, 0.75); }
    body main ul, body main li {
      margin: 0;
      padding: 0;
      list-style: 0; }
    body main > ul {
      display: flex;
      justify-content: space-around; }
      body main > ul > li {
        display: block;
        flex-grow: 0;
        flex-shrink: 0; }
        body main > ul > li div {
          text-align: center;
          margin-bottom: 0.25rem; }
        body main > ul > li > ul {
          display: block;
          width: 3rem;
          padding: 2rem 1rem 1rem 1rem;
          border-radius: 8px;
          background: #ddd; }
          body main > ul > li > ul > li {
            display: block;
            width: 3rem;
            height: 3rem;
            overflow: hidden;
            position: relative;
            margin-top: -1rem;
            background-color: #1cafab;
            border: none;
            border-radius: 4px;
            outline: none;
            box-shadow: 0px 0px 3px 0px black;
            color: #fff;
            font-size: 2rem;
            font-weight: 300;
            line-height: 3rem;
            text-align: center; }
  body footer {
    grid-area: footer; }
    body footer ul, body footer li {
      margin: 0;
      padding: 0;
      list-style: 0; }
    body footer ul {
      margin: 2rem;
      display: flex;
      justify-content: space-around; }
      body footer ul li {
        display: block;
        width: 3rem;
        height: 3rem;
        background-color: #1cafab;
        border: none;
        border-radius: 4px;
        outline: none;
        box-shadow: 0px 0px 3px 0px black;
        color: #fff;
        font-size: 2rem;
        font-weight: 300;
        line-height: 3rem;
        text-align: center; }

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