CSS CSS Layout Box Model Concepts Viewport Units

Alana Warson
Alana Warson
5,296 Points
Posted by Alana Warson
Alana Warson
5,296 Points

Set header element and set it's value to 25% of viewpoint height.

I wrote .header { height=25%vh; }

I keep getting an error message: "Are you using the 'vh' unit to give the header below

style.css 
/* Complete the challenge by writing CSS below */
.header {
  height= .25vh;

}
index.html 
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Developer Diane's blog</title>
  <link rel="stylesheet" href="page.css">
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <header>
    Developer Diane’s Blog
  </header>
  <article>
    <section class="intro">
      <h1>The verdict is in. CSS Layout is great!</h1>
      <p>I’ve been working with CSS for a while now, and I have to say, it’s pretty awesome. I love being able to separate content from presentation, and to keep all my styles in an external stylesheet.</p>
      <p>I’ve had a pretty good grasp on the basics for a while now, but I needed to learn more about how to control layout with my CSS. Understanding CSS layout meant first exploring the parts of the CSS box model.</p>
    </section>
    <section class="featured">
      <h2>The CSS Box Model</h2>
      <p>There are lots of great resources online to help you learn the CSS Box Model. I like the CSS Tricks article <a href="https://css-tricks.com/the-css-box-model/" target="_blank">The CSS Box Model</a> by Chris Coyier. To quote the author:</p>
      <blockquote>At the risk of over-repeating myself: <strong>every element in web design is a rectangular box.</strong></blockquote>
      <p>That’s right! Every HTML element is considered by the browser to be a rectangular box.</p>
      <p>The CSS Box Model consists of four properties: content, padding, border, and margin. I've included a graphic from Coyier’s article to illustrate this principle.</p>
      <p class="clear">It’s pretty easy to understand the Content portion of the box model. The content is whatever your HTML consists of. It could be a paragraph full of text, or a bulleted list, or an image.</p>
      <p>Beginning developers may have some trouble keeping the other parts of the box model straight, so let’s examine them one by one.</p>
    </section>
    <footer>©2020 Developer Diane.</footer>
</body>
</html>

3 Answers

Mel Rumsey
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STAFF
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Mel Rumsey
Treehouse Staff
Mel Rumsey
.a{fill-rule:evenodd;}techdegree seal-36
Mel Rumsey
Treehouse Staff

Hi Alana Warson, With CSS you want to use a colon rather than an equal sign when setting values.

.header {
  height= .25vh;

}

will need to be:

.header {
  height: 25vh;

}

Hope this helps! Happy coding :D

Alana Warson
Alana Warson
5,296 Points
Alana Warson
Alana Warson
5,296 Points

I still get an error message saying, "Are you using the 'vh' unit to give the header element the correct height?

Mel Rumsey
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree seal-36
Mel Rumsey
Treehouse Staff
Mel Rumsey
.a{fill-rule:evenodd;}techdegree seal-36
Mel Rumsey
Treehouse Staff

Ahhh I see, you are using .header as if you are trying to change an element with a `class name of "header". Try using just header to target the header element specifically. Also, viewheight is measured in percentages. If you want it to be 25% it will need to be 25vh.

header {
  height: 25vh;
}