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Bootstrap4LayoutBoxSizingExample3

A Pen By kenanhancer

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HTML

            
              <div class="buttons">
  <p class="intro">Click the <code>border-box</code> button to fix the layout with the power of Box Sizing!</p>
  <button id="content">content-box</button>
  <button id="border">border-box</button>
</div>

<div class="parent">
  <form class="twins" action="/action_page.php">
    First name:<br>
    <input type="text" name="firstname" value="Mickey"><br> Last name:<br>
    <input type="text" name="lastname" value="Mouse"><br> Comments:
    <br>
    <textarea name="message" rows="5" cols="30">
</textarea>
    <br><br>
    <input type="submit" value="Submit">
  </form>
  <form class="twins" action="/action_page.php">
    First name:<br>
    <input type="text" name="firstname" value="Mickey"><br> Last name:<br>
    <input type="text" name="lastname" value="Mouse"><br> Comments:
    <br>
    <textarea name="message" rows="5" cols="30">
</textarea>
    <br><br>
    <input type="submit" value="Submit">
  </form>
</div>
!

CSS

            
              .parent {
  width: 70%;
  border: 5px solid #E18728;
  float: left;
}

.child {
  width: 90%;
  padding: 20%;
  border: 4px solid black;
  margin: .5em auto;
}

.twins {
  width: 50%;
  padding: 1em;
  border: 4px solid black;
  float: left;
}

input, textarea {
    width: 100%;
}

body {
  font-family: sans-serif;
  font-size: 1.1em;
}

.buttons {
  margin-bottom: .5em;
}

p:not(.intro) {
  text-align: center;
}
!

JS

            
              $("#content").on("click", function() {
  $("*").css("box-sizing", $(this).text());
});

$("#border").on("click", function() {
  $("*").css("box-sizing", $(this).text());
});
!
999px
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Console