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HTML

              
                <html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css">  
  <title>Float approach for I heart CSS calc() blog post</title>
</head>

<body>


  <main>

    <article class="comment">
      <div class="comment__author-picture ">
        <i class="fa fa-user"></i> 
      </div>
      <h3 class="comment__title">
        My great comment
      </h3>
      <div class="comment__author-name-date">
        by Jane Doe on March 2, 2016
      </div>
      <div class="comment__content">
        <p>“Lorem Ipsum. Proin gravida nibh vel velit auctor aliquet. Aenean sollicitudin, lorem quis bibendum auctor, nisi elit consequat ipsum, nec sais sem.”</p>
      </div>
    </article>

  </main>

</body>

</html>
              
            
!

CSS

              
                @import "bourbon"
@import "neat"

$base-font-family: 'Open Sans', sans-serif
$base-font-color: #888
$base-font-size: 14px
$base-line-height: 1.6em

$medium-screen-up: new-breakpoint(min-width em(600px))

body
  padding: 20px
  color: $base-font-color
  font-family: $base-font-family
  font-size: $base-font-size
  line-height: $base-line-height

main
  max-width: 800px
  margin-right: auto
  margin-left: auto
  
.comment
  background: #EEE
  border: solid 1px #CCC
  padding: 20px

.comment__author-picture
  float: left
  display: inline
  width: 60px
  height: 60px
  margin-right: 20px
  margin-bottom: 20px
  background-color: #FFF
  border: solid 1px #CCC
  border-radius: 50%
  color: #CCC
  font-size: 40px
  line-height: 53px
  text-align: center

.comment__title
  margin-top: 8px
  margin-bottom: 3px
  color: #000
  font-size: 18px
  font-weight: normal

.comment__author-name-date
  margin-bottom: 20px
 
.comment__content
  clear: both
  @include media($medium-screen-up)
    width: calc(100% - 80px)
    margin-left: 80px

  

  
              
            
!

JS

              
                
              
            
!
999px

Console