147 lines
4.6 KiB
Markdown
147 lines
4.6 KiB
Markdown
---
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id: bad87fee1348bd9aedf08805
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title: Use CSS Selectors to Style Elements
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cJKMBT2'
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forumTopicId: 18349
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---
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## Description
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<section id='description'>
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With CSS, there are hundreds of CSS properties that you can use to change the way an element looks on your page.
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When you entered <code><h2 style="color: red;">CatPhotoApp</h2></code>, you were styling that individual <code>h2</code> element with inline CSS, which stands for Cascading Style Sheets.
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That's one way to specify the style of an element, but there's a better way to apply CSS.
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At the top of your code, create a <code>style</code> block like this:
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```html
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<style>
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</style>
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```
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Inside that style block, you can create a <dfn>CSS selector</dfn> for all <code>h2</code> elements. For example, if you wanted all <code>h2</code> elements to be red, you would add a style rule that looks like this:
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```html
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<style>
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h2 {
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color: red;
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}
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</style>
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```
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Note that it's important to have both opening and closing curly braces (<code>{</code> and <code>}</code>) around each element's style rule(s). You also need to make sure that your element's style definition is between the opening and closing style tags. Finally, be sure to add a semicolon to the end of each of your element's style rules.
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</section>
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## Instructions
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<section id='instructions'>
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Delete your <code>h2</code> element's style attribute, and instead create a CSS <code>style</code> block. Add the necessary CSS to turn all <code>h2</code> elements blue.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: The style attribute should be removed from your <code>h2</code> element.
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testString: assert(!$("h2").attr("style"));
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- text: You should create a <code>style</code> element.
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testString: assert($("style") && $("style").length >= 1);
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- text: Your <code>h2</code> element should be blue.
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testString: assert($("h2").css("color") === "rgb(0, 0, 255)");
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- text: Your stylesheet <code>h2</code> declaration should be valid with a semicolon and closing brace.
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testString: assert(code.match(/h2\s*\{\s*color\s*:.*;\s*\}/g));
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- text: All your <code>style</code> elements should be valid and have closing tags.
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testString: assert(code.match(/<\/style>/g) && code.match(/<\/style>/g).length === (code.match(/<style((\s)*((type|media|scoped|title|disabled)="[^"]*")?(\s)*)*>/g) || []).length);
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<h2 style="color: red;">CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div>
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```html
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<style>
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h2 {
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color: blue;
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}
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</style>
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<h2>CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div>
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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</section>
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