style.css

    .mid {
      text-align: center;
    }

    .navbar a {
      color: black;
    }

    .navbar {
      height: 50px;
      background: black;
    }

    .navbar ul {
      margin: 0;
      padding: 0;
      height: 100%;
    }

    .navbar li {
      color: white;
      font-weight: bold;
      line-height: 50px;
      list-style: none;
      display: inline-block;
      padding-left: 10px;
      padding-right: 20px;
      box-sizing: border-box;
      border-right: solid black 1px;
      background: #666666;
    }

    #button {
      font-size: 1.2em;
      padding: 12px 24px;
      color: white;
      border: 1px solid;
      border-radius: 4px;
      background-color: #5cb85c;
      border-color: #4cae4c;
      cursor: pointer;
      text-decoration: none;
    }

    #logo {
      vertical-align: middle;
      height: 30px;
    }