a:hover {
    text-decoration: underline;
  }
  
  .hub-info {
    display: flex;
    justify-content: center;
    align-items: center;
  }

  /* Hero Unit ----------------------*/
  .hero-unit {
    background: url(./pexels-fauxels-3182774-25pct.jpg) no-repeat center center;
    height: 100vh;
    background-size: cover;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
  }
  .hero-unit h1,
  .hero-unit h2,
  .hero-unit h3,
  .hero-unit h4,
  .hero-unit h5,
  .hero-unit h6 {
    margin-top: -0.5rem;
    margin-bottom: 0;
    color: white;
  }
  .hero-unit h1 {
    font-weight: bold;
  }
  .hero-unit hgroup {
    margin: 3rem 0;
  }
  .hero-unit .card-icon { /* front of card */
    display: block;
    margin: 0.5rem auto 0;
    font-size: 2rem;
    color: white;
  }
  .hero-unit .clients {
    margin: 2rem auto;
  }
  .hero-unit .clients a {
    color: white;
  }
  .clients .fa-stack-2x {
    color: gray;
  }
  .clients:hover .fa-stack-2x {
    color: #333333;
  }
  
  /* Card design - front */
  .button.large {
    margin: 0;
    padding: 3.25rem;
  }
  .button.large a {
    color: white;
    font-size: 1.75rem;
    font-weight: 100;
    margin-top: 2rem;
  }
  
  /* Card design - back */
  .panel i {
    font-size: 2rem;
    display: block;
    float: left;
    width: 20%;
    opacity: 0.5;
  }
  .panel p, 
  .panel small {
    width: 80%;
    float: right;
  }
  .panel a:hover {
    text-decoration: underline;
  }
  .panel small {
    margin-top: -0.5rem;
    font-style: italic;
  }
  
  /* Buttons Card Flipper 
   * Source: https://cssdeck.com/labs/rxcleo5w
   */
  .flip-cards {
    float: left;
    width: 100%;
    height: 100%;
    padding-left: 1rem;
  }
  
  .flip-cards li {
    float: left;
    width: 33.3%;
    height: 180px;
    position: relative;
    padding: 0;
  }
  
  .flip-cards li:hover {
    cursor: pointer;
  }
  
  .flip-cards li:hover .card-front {
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
    -ms-transform: rotateY(180deg);
    -o-transform: rotateY(180deg);
    transform: rotateY(180deg);
    -webkit-transform: perspective(1000) rotateY(180deg);
    -moz-transform: perspective(1000) rotateY(180deg);
    -ms-transform: perspective(1000) rotateY(180deg);
    -o-transform: perspective(1000) rotateY(180deg);
    transform: perspective(1000) rotateY(180deg);
  }
  
  .flip-cards li:hover .card-back {
    z-index: 950;
    -webkit-transform: rotateY(0deg);
    -moz-transform: rotateY(0deg);
    -ms-transform: rotateY(0deg);
    -o-transform: rotateY(0deg);
    transform: rotateY(0deg);
    -webkit-transform: perspective(1000) rotateY(0deg);
    -moz-transform: perspective(1000) rotateY(0deg);
    -ms-transform: perspective(1000) rotateY(0deg);
    -o-transform: perspective(1000) rotateY(0deg);
    transform: perspective(1000) rotateY(0deg);
  }
  
  .flip-cards .card-front,
  .flip-cards .card-back {
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    -ms-backface-visibility: hidden;
    -o-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transition: -webkit-transform 0.6s;
    -moz-transition: -moz-transform 0.6s;
    -o-transition: -o-transform 0.6s;
    transition: transform 0.6s;
    display: block;
    height: 100%;
    position: absolute;
    width: 100%;
  }
  
  .flip-cards .card-front {
    -webkit-transform: perspective(1000) rotateY(0);
    -moz-transform: perspective(1000) rotateY(0);
    -ms-transform: perspective(1000) rotateY(0);
    -o-transform: perspective(1000) rotateY(0);
    transform: perspective(1000) rotateY(0);
    z-index: 900;
  }
  
  .flip-cards .card-back {
    -webkit-transform: rotateY(-180deg);
    -moz-transform: rotateY(-180deg);
    -ms-transform: rotateY(-180deg);
    -o-transform: rotateY(-180deg);
    transform: rotateY(-180deg);
    z-index: 800;
  }
  
  /* Button Card Colors */
  .flip-cards .panel {
    border: none;
  }
  
  .flip-cards .panel i,
  .flip-cards .panel p,
  .flip-cards .panel a,
  .flip-cards .panel small {
    color: white;
  }
  
  /* First button color */
  .flip-cards li:first-child > .button {
    background-color: rgba(40, 57, 77, 0.8);
  }
  .flip-cards li:first-child > .panel {
    background-color: rgba(40, 57, 77, 1);
  }
  
  /* Second button color */
  .flip-cards li:nth-child(2) > .button {
    background-color: rgba(109, 193, 202, 0.8);
  }
  .flip-cards li:nth-child(2) > .panel {
    background-color: rgba(109, 193, 202, 1);
  }
  
  /* Third button color */
  .flip-cards li:nth-child(3) > .button {
    background-color: rgba(211, 81, 45, 0.8);
  }
  .flip-cards li:nth-child(3) > .panel {
    background-color: rgba(211, 81, 45, 1);
  }
  
  /* Fourth button color */
  .flip-cards li:nth-child(4) > .button {
    background-color: rgba(235, 167, 36, 0.8);
  }
  .flip-cards li:nth-child(4) > .panel {
    background-color: rgba(235, 167, 36, 1);
  }
  
  /* Fifth button color */
  .flip-cards li:nth-child(5) > .button {
    background-color: rgba(75, 135, 150, 0.8);
  }
  .flip-cards li:nth-child(5) > .panel {
    background-color: rgba(75, 135, 150, 1);
  }
  
  /* Sixth (last) button color */
  .flip-cards li:last-child > .button {
    background-color: rgba(100, 66, 87, 0.8);
  }
  .flip-cards li:last-child > .panel {
    background-color: rgba(100, 66, 87, 1);
    color: white;
  }
  
  /*
   * RESPONSIVENESS -------------------------------------------------
   */
  @media only screen and ( max-width: 40em ) {
      .hero-unit {
          height: 800px;
      }
      .flip-cards li {
          width: 50%;
          /*height: 160px;*/
      }
  }
  @media only screen and ( max-width: 30em ) {
      .hero-unit h1 {
          font-size: 1.75rem;
      }
      .hero-unit h2 {
          font-size: 1.125rem;
      }
  }
  @media only screen and ( max-width: 25em ) {
      .hero-unit {
          height: 920px;
      }
      .hero-unit hgroup {
          margin: 2rem 0;
      }
      .hero-unit h1 {
          font-size: 1.35rem;
          padding-bottom: 0.25rem;
      }
      .hero-unit h2 {
          font-size: 0.85rem;
      }
      .hero-unit .card-icon {
          font-size: 1.35rem;
      }
      .hero-unit .card-back .card-icon {
          font-size: 2rem;
          margin: 0;
          padding: 5px 0 20px 5px;
      }
      .flip-cards li {
          width: 100%;
          font-size: 1.35rem;
          height: 120px;
      }
      .flip-cards .panel p {
          display: none;	
      }
      .flip-cards .panel small {
          margin: 0;
      }
      .button.large {
          padding: 2rem;
      }
      .button.large a {
          font-size: 1.35rem;
      }
  }