jquery - 如何在 jquery 框内居中标记 i

Question

我有这个图标 fa fa-long-arrow-right 我希望它们在我的 div 中居中。我怎样才能做到这一点？可以用 bootstrap 完成吗？

jQuery(document).ready(function($) {
  //portfolio - show link
  $('.fdw-background').hover(
    function() {
      $(this).animate({
        opacity: '1'
      });
    },
    function() {
      $(this).animate({
        opacity: '0'
      });
    }
  );
});

.tiles_border {
  border: 1px #ffffff solid;
  border-radius: 6px;
}

.fdw-background {
  background-color: rgba(0, 0, 0, 0.6);
  opacity: 0;
  width: 100%;
  height: 100%;
  border: 1px #ffffff solid;
  border-radius: 6px;
  cursor: pointer;
}

.fdw-background h2 {
  font-weight: 700;
  font-family: 'Dosis', sans-serif;
  text-align: center;
  color: #FFF;
}

.fdw-background p {
  text-align: center;
  color: #fff;
  font-size: 20px;
}

.fdw-background .fdw-port {
  text-align: center;
  padding: 0 40px 0;
}

.fdw-background .fdw-port a {
  padding: 8px 15px;
  font-size: 1em;
}


/*subtitle*/

.fdw-subtitle {
  font-size: 0.8em;
  margin-top: -20px;
  color: #0CF;
}

.fdw-subtitle a {
  color: #F90;
}

#koncerty {
  background-image: url("http://placehold.it/400x550");
  height: 400px;
  background-repeat: no-repeat;
  background-size: cover;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
<script src="https://use.fontawesome.com/62cf094036.js"></script>
<div class="container">
  <div class="row">
    <div class="col-md-6 col-sm-12">
      <div id="koncerty" class="tiles_border">
        <div style="opacity: 0;" class="fdw-background atrakcje-tekst">
          <h2>KONCERTY</h2>
          <br>

          <p>Na targach wystąpią:
            <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Andre</i> <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Bobi</i> <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Kosmokwaki</i>
          </p>
        </div>
      </div>

    </div>
  </div>
</div>

Answer 1

您可以首先使用两种方法是在包含图标的 div 上使用 bootstrap col-offset-4 类，这将为您提供 4 列空白请注意，您的 div 中的类从 col-md-6 更改为 col-md-offset-4

<div class="col-md-offset-4 col-sm-12">
            <div id="koncerty" class="tiles_border">
                <div style="opacity: 0;" class="fdw-background atrakcje-tekst">
                <h2>KONCERTY</h2>
                <br>

                <p>Na targach wystąpią:
                    <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Andre</i> <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Bobi</i> <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Kosmokwaki</i>
          </p>
        </div>
      </div>

    </div>

另一种方法是使用 col-md-12 设置全宽列并使用 text-center 类将图标居中

<div class="col-sm-12 text-center">
            <div id="koncerty" class="tiles_border">
                <div style="opacity: 0;" class="fdw-background atrakcje-tekst">
                <h2>KONCERTY</h2>
                <br>

                <p>Na targach wystąpią:
                    <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Andre</i> <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Bobi</i> <br>
            <i class="fa fa-long-arrow-right" aria-hidden="true">Kosmokwaki</i>
          </p>
        </div>
      </div>

    </div>