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---
id: bad87fee1348bd9aecf08806
title: Use a CSS Class to Style an Element
challengeType: 0
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videoUrl: https://scrimba.com/c/c2MvDtV
forumTopicId: 18337
2019-04-22 23:39:40 +06:00
localeTitle: Используйте селектор класса в CSS для стилизации элемента
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---
## Description
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< section id = 'description' >
Классы - многоразовые стили, которые можно добавить к элементам HTML. Вот пример объявления класса CSS: < blockquote > < style> < br > .blue-text { < br > color: blue; < br > } < br > < / style> < / blockquote > Вы можете видеть, что мы создали класс CSS, который назвали < code > blue-text< / code > в < code > < style> < / code > . Вы можете применить класс к HTML-элементу следующим образом: < code > < h2 class=" blue-text" > CatPhotoApp< /h2> < / code > Обратите внимание, что в элементе < code > style< / code > CSS имена классов начинаются с точки. В атрибуте класса HTML-элементов имя класса не включает точку.
< / section >
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## Instructions
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< section id = 'instructions' >
Внутри элемента < code > style</ code > измените селектор < code > h2</ code > на < code > .red-text</ code > и обновите значение цвета с < code > blue</ code > на < code > red</ code > . Задайте вашему элементу < code > h2</ code > атрибут < code > class</ code > с о значением < code > & #39 ; red-text& #39 ; </ code > .
< / section >
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## Tests
< section id = 'tests' >
```yml
tests:
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- text: Your < code > h2</ code > element should be red.
testString: assert($("h2").css("color") === "rgb(255, 0, 0)");
- text: Your < code > h2</ code > element should have the class < code > red-text</ code > .
testString: assert($("h2").hasClass("red-text"));
- text: Your stylesheet should declare a < code > red-text</ code > class and have its color set to red.
testString: assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;\s*\}/g));
- text: Do not use inline style declarations like < code > style="color& #58 ; red"</ code > in your < code > h2</ code > element.
testString: assert($("h2").attr("style") === undefined);
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```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'html-seed' >
```html
< style >
h2 {
color: blue;
}
< / style >
< h2 > CatPhotoApp< / h2 >
< main >
< p > Click here to view more < a href = "#" > cat photos< / a > .< / p >
< a href = "#" > < img src = "https://bit.ly/fcc-relaxing-cat" alt = "A cute orange cat lying on its back." > < / a >
< div >
< p > Things cats love:< / p >
< ul >
< li > cat nip< / li >
< li > laser pointers< / li >
< li > lasagna< / li >
< / ul >
< p > Top 3 things cats hate:< / p >
< ol >
< li > flea treatment< / li >
< li > thunder< / li >
< li > other cats< / li >
< / ol >
< / div >
< form action = "/submit-cat-photo" >
< label > < input type = "radio" name = "indoor-outdoor" checked > Indoor< / label >
< label > < input type = "radio" name = "indoor-outdoor" > Outdoor< / label > < br >
< label > < input type = "checkbox" name = "personality" checked > Loving< / label >
< label > < input type = "checkbox" name = "personality" > Lazy< / label >
< label > < input type = "checkbox" name = "personality" > Energetic< / label > < br >
< input type = "text" placeholder = "cat photo URL" required >
< button type = "submit" > Submit< / button >
< / form >
< / main >
```
< / div >
< / section >
## Solution
< section id = 'solution' >
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```html
< style >
.red-text {
color: red;
}
< / style >
< h2 class = "red-text" > CatPhotoApp< / h2 >
< main >
< p > Click here to view more < a href = "#" > cat photos< / a > .< / p >
< a href = "#" > < img src = "https://bit.ly/fcc-relaxing-cat" alt = "A cute orange cat lying on its back." > < / a >
< div >
< p > Things cats love:< / p >
< ul >
< li > cat nip< / li >
< li > laser pointers< / li >
< li > lasagna< / li >
< / ul >
< p > Top 3 things cats hate:< / p >
< ol >
< li > flea treatment< / li >
< li > thunder< / li >
< li > other cats< / li >
< / ol >
< / div >
< form action = "/submit-cat-photo" >
< label > < input type = "radio" name = "indoor-outdoor" checked > Indoor< / label >
< label > < input type = "radio" name = "indoor-outdoor" > Outdoor< / label > < br >
< label > < input type = "checkbox" name = "personality" checked > Loving< / label >
< label > < input type = "checkbox" name = "personality" > Lazy< / label >
< label > < input type = "checkbox" name = "personality" > Energetic< / label > < br >
< input type = "text" placeholder = "cat photo URL" required >
< button type = "submit" > Submit< / button >
< / form >
< / main >
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```
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< / section >