143 lines
3.8 KiB
Markdown
143 lines
3.8 KiB
Markdown
---
|
|
id: bad87fee1348bd9aecf08806
|
|
title: Usa una clase CSS para aplicar estilos a un elemento
|
|
challengeType: 0
|
|
videoUrl: 'https://scrimba.com/c/c2MvDtV'
|
|
forumTopicId: 18337
|
|
dashedName: use-a-css-class-to-style-an-element
|
|
---
|
|
|
|
# --description--
|
|
|
|
Las clases son estilos reutilizables que se pueden agregar a los elementos HTML.
|
|
|
|
A continuación te presentamos un ejemplo de cómo declarar una clase CSS:
|
|
|
|
```html
|
|
<style>
|
|
.blue-text {
|
|
color: blue;
|
|
}
|
|
</style>
|
|
```
|
|
|
|
Puedes ver que hemos creado una clase CSS llamada `blue-text` dentro de la etiqueta `<style>`. Puedes aplicar una clase a un elemento HTML de este modo: `<h2 class="blue-text">CatPhotoApp</h2>`. Ten en cuenta que en tu elemento CSS `style`, los nombres de clase comienzan con un punto. En el atributo "class" de tus elementos HTML, el nombre de la clase no lleva punto delante.
|
|
|
|
# --instructions--
|
|
|
|
Dentro de tu elemento `style`, cambia el selector `h2` a `.red-text` y actualiza el valor del color de `blue` a `red`.
|
|
|
|
Asigna a tu elemento `h2` el atributo `class` con un valor de `red-text`.
|
|
|
|
# --hints--
|
|
|
|
Tu elemento `h2` debe ser de color rojo ("red").
|
|
|
|
```js
|
|
assert($('h2').css('color') === 'rgb(255, 0, 0)');
|
|
```
|
|
|
|
Tu elemento `h2` debe incluir la clase `red-text`.
|
|
|
|
```js
|
|
assert($('h2').hasClass('red-text'));
|
|
```
|
|
|
|
Tu hoja de estilos debe declarar una clase `red-text` y su color debe ser `red` (rojo).
|
|
|
|
```js
|
|
assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;?\s*\}/g));
|
|
```
|
|
|
|
No debes usar declaraciones de tipo inline style como `style="color: red"` en tu elemento `h2`.
|
|
|
|
```js
|
|
assert($('h2').attr('style') === undefined);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```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://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" 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="https://freecatphotoapp.com/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>
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```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://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" 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="https://freecatphotoapp.com/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>
|
|
```
|