Where do I put this?


#1

<!DOCTYPE html>
<html>
  <head>
    <link href="main.css" rel="stylesheet">
  </head>
  
  <body>
     <div class="nav"> 
      <div class="container">
        <ul>
          <li><a href="#">Airbnb logo</a></li>
          <li><a href="#">Browse</a></li>
        </ul>
        <ul>
          <li><a href="#">Sign Up</a></li>
          <li><a href="#">Log In</a></li>
          <li><a href="#">Help</a></li> 
        </ul>
      </div>
    </div>

    <div class="jumbotron">
      <div class="container">
        <h1>Find a place to stay.</h1> 
        <p>Rent from people in over 34,000 cities and 192 countries.</p>
      </div>
    </div> 

    <div class="learn-more">
	  <div>
		<div>
	  	  <div>
			<h3>Travel</h3>
			<p>From apartments and rooms to treehouses and boats: stay in unique spaces in 192 countries.</p>
			<p><a href="#">See how to travel on Airbnb</a></p>
		  </div>
		  <div>
			<h3>Host</h3>
			<p>Renting out your unused space could pay your bills or fund your next vacation.</p>
			<p><a href="#">Learn more about hosting</a></p>
		  </div>
		  <div>
			<h3>Trust and Safety</h3>
			<p>From Verified ID to our worldwide customer support team, we've got your back.</p>
			<p><a href="#">Learn about trust at Airbnb</a></p>
		  </div>
	    </div>
	  </div>
	</div>
  </body>
</html>

Where do I put the

.jumbotron h1 {
  color=#fff
  font-size=20px
}

#2

You put it in your main.css file. Anywhere in that file, but not inside one of your other CSS rules.

Don't forget the semicolons!


#3

.jumbotron h1 {
color=#fff
font-size=20px
}

this is my code
but it says

Oops, try again. Set the color of the p element inside div class="jumbotron"../div to #fff

o.o
Also, I did put the semicolons


#4

Also, no equal signs, that isn't how CSS assigns values. Check your other CSS rules to see how it's done.