<div class="container">
  <p>The blue element inside the white container has a left margin set. Try changing it to see how it affects the space between the element and the text next to it.</p>

  <div class="parent">
    <div class="element">
      I have a left margin.
    </div>
    <p style="text-align: justify;">
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cum, iste, animi magni suscipit nobis sint voluptatem asperiores sunt fugiat in enim aspernatur nostrum veritatis repellat quasi modi neque dolores aliquam.
    </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;
  max-width: 700px;
}

.parent {
  border: 2px solid black;
  background-color: white;
  height: 400px;
}

.element {
  padding: 20px;
  background-color: #0099cc;
  color: white;
  width: 250px;
  height: 100px;
  float: right;
  margin-left: 30px;
}