<div class="container">
  <p>Change the value of the <code>border-left-width</code> property to see how the border changes.</p>
  <div class="element">
    <p>
      I have a solid left border and a skyblue background color.
    </p>
  </div>
</div>
body {
    background-color: #F5F5F5;
    color: #555;
    font-size: 1.1em;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
    margin: 40px auto 0;
    max-width: 700px;
}

.element {
    padding: 20px;
    background-color: skyblue;
    color: white;
    height: 200px;
    border-left-style: solid;
    border-left-color: deepPink;
    border-left-width: 10px;
}