How can I insert vertical blank space into an HTML document?

I am writing a quiz in HTML and I would like to insert a consistent blank vertical space between questions (like one would use vspace{3 cm} in LaTeX).

For example:

<html>
  <body>
    <p>
     This is the first question?
      <!-- This is where I want about 3 cm of space -->
    </p>
    <p>
     This is the second question?
     <!-- This is where I want about 3 cm of space -->
    </p>
  </body>
</html>

Is there a straightforward way of doing this using just HTML and CSS?

Solution

Read up some on CSS. It's fun: CSS: em, px, pt, cm, in…

<style>
  .bottom-three {
     margin-bottom: 3cm;
  }
</style>


<p class="bottom-three">
   This is the first question?
</p>
<p class="bottom-three">
   This is the second question?
</p>