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HTML 

              
                <div class="myContainer">
  
<!-- Centered heading -->
  <div class="container-fluid">
    <div class="row text-center">
      <div class="col-md-3  col-sm-2 col-xs-0"></div>
      <div class="col-md-6  col-sm-8 col-xs-12">
        <h1 class="text-center">Random Travel Quotes</h1>
      </div>
      <div class="col-md-3  col-sm-2 col-xs-0"></div>
    </div>
  </div>
  
  <!-- Botones -->
  
  <div class="container-fluid">
    <div class="row">
      <div class="col-lg-5 col-md-5 col-sm-4 col-xs-2"></div>
      <div class="col-lg-2 col-md-2 col-sm-4 col-xs-8 text-center">
        <button type="button" class="btn btn-success" id="newQuote" onclick="generate()">Give me more inspiration!</button>
      </div>
      <div class=" col-lg-5 col-md-5 col-sm-4 col-xs-2"></div>
    </div>
  </div>
  
  <!-- Quote screen -->
  
  <div class="container-fluid">
    <div class="row">
      <div class="col-md-3 col-sm-2 col-xs-0"></div>
      <div class="col-md-6 col-sm-8 col-xs-12">
        <div class="screen">
          <div id="cita">"Find your favourite travel quote right here!"
          </div>
          <div class="text-right" id="autor">- Random Travel Quotes
          </div>
          <div id="share">
            <a class="twitter-share-button"
               id="shareQuote"
               onclick="share()"
               href="https://twitter.com/intent/tweet?text=" data-size="default">
            </a>
          </div>
        </div>
      </div>
      <div class="col-md-3 col-sm-2 col-xs-0"></div>
    </div>
  </div>
</div>
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CSS 

              
                .myContainer {
  background-image: url("http://www.storychick.com/wp-content/uploads/2015/07/o-road-trip-facebook.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position:center;
  position: absolute;
  width: 100%;
}

h1 {
  font-family: 'Fredericka the Great', cursive;
  color: #EAEAEA;
  font-size: 420%;
  margin: 10% auto 10px auto;
  display: block;
}

.screen{
  position: relative;
  background-color: #ffffff;
  opacity: 0.5;
  height: auto;
  border-radius: 25px;
  margin-top: 280px;
  bottom: 50px;
}

.btn {
  margin-top: 25px;
}

.screen{
  padding: 20px 40px 10px 40px;
  font-family: 'Corben', cursive;
  font-size: 1.2em;
}

#autor {
  font-weight: bold;
  font-size: 1.1em;
}

a {
  z-index: 10;
}
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JS 

              
                // Array with the quotes and the authors

var quotes = [
  ["Not all those who wander are lost.", "J. R. R. Tolkien"],
  ["The journey of a thousand miles begins with a single step.", "Lao Tzu"],
  ["A journey is like marriage. The certain way to be wrong is to think you control it.", "J. Steinbeck"],
  ["Your true traveler finds boredom rather agreeable than painful. It is the symbol of his liberty — his excessive freedom. He accepts his boredom, when it comes, not merely philosophically, but almost with pleasure.", "Aldous Huxley"],
  ["I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to move.", "R. L. Stevenson"],
  ["Travel makes one modest. You see what a tiny place you occupy in the world.", "G. Flaubert"],
  ["It is not down in any map; true places never are.", "H. Melville"]
];

/* Variables for the random number (rand)
   the quote (cita)
   and the author (autor) */

var rand;
var cita;
var autor;
var twitterURL = "https://twitter.com/intent/tweet?text=";

/* This function generates a random number and saves the random quote and author in global variables cita and author */

function generate() {
  rand = Math.floor(Math.random() * quotes.length);
  cita = document.getElementById("cita").innerHTML = "\"" + this.quotes[rand][0] + "\"";
  autor = document.getElementById("autor").innerHTML = "- " + this.quotes[rand][1];
  alert(encodeURIComponent(this.quotes[rand][0]));
  alert(encodeURIComponent(this.quotes[rand][1]));
 
  
}

/* This function generates the Twitter URL to share including the quote and the author */

function share() {
  twitterURL += encodeURIComponent(this.quotes[rand][0]) + " – " + encodeURIComponent(this.quotes[rand][1]);
  document.getElementById("shareQuote").href = twitterURL;
  alert(twitterURL);
}

$(document).ready(function() {

  $("#shareQuote").click(function() {
    twitterURL += encodeURIComponent(cita) + " – " + encodeURIComponent(autor);
    document.getElementById("shareQuote").href = twitterURL;
    alert(twitterURL);
  });
});
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