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              <!-- This demo uses flex grid but you can use float grid too -->

<div class="row">
  <div class="columns">
    <h2>Responsive Embed (4:3)</h2>
    <p>Wrap embedded content like videos, maps, and calendars in a responsive embed container to maintain the correct aspect ratio regardless of screen size.</p>
    <p>To make sure embedded content maintains its aspect ratio as the width of the screen changes, wrap the <code>iframe</code>, <code>object</code>, <code>embed</code>, or <code>video</code> in a container with the <code>.responsive-embed</code> class.</p>
    <div class="callout primary">
      <p>The default aspect ratio is 4:3. The <code>.widescreen</code> class will change the container's aspect ratio to 16:9.</p>

<div class="row">
  <div class="medium-8 columns">
    <div class="responsive-embed">
      <iframe width="420" height="315" src="https://www.youtube.com/embed/mM5_T-F1Yn4" frameborder="0" allowfullscreen></iframe>

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