198 lines
5.1 KiB
Markdown
198 lines
5.1 KiB
Markdown
---
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id: bad87dee1348bd9aede07836
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title: Usa un atributo de id para aplicar estilo a un elemento
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cakyZfL'
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forumTopicId: 18339
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dashedName: use-an-id-attribute-to-style-an-element
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---
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# --description--
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Una cosa genial de los atributos `id` es que, al igual que las clases, puedes aplicarles estilos con CSS.
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Sin embargo, un `id` no es reutilizable y solo debe aplicarse a un único elemento. Un `id` también tiene mayor especificidad (importancia) que una clase, así que si aplicas un id y una clase al mismo elemento y sus estilos se contradicen, se aplicarán los estilos del `id`.
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A continuación te mostramos un ejemplo de cómo puedes tomar tu elemento con el atributo `id` llamado `cat-photo-element` y asignarle el color de fondo verde. En tu elemento `style` agrega la siguiente declaración:
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```css
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#cat-photo-element {
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background-color: green;
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}
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```
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Ten en cuenta que dentro de tu elemento `style` siempre debes hacer referencia a las clases agregándoles un punto `.` adelante del nombre. Para hacer referencia a un id, debes agregar `#` delante de su nombre.
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# --instructions--
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Intenta asignar a tu formulario, que ahora tiene el atributo `id` llamado `cat-photo-form`, un fondo verde.
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# --hints--
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Tu elemento `form` debe tener el id `cat-photo-form`.
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```js
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assert($('form').attr('id') === 'cat-photo-form');
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```
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Tu elemento `form` debe tener `background-color` de color verde (green).
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```js
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assert($('#cat-photo-form').css('background-color') === 'rgb(0, 128, 0)');
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```
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Tu elemento `form` debe tener un atributo `id`.
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```js
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assert(
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code.match(/<form.*cat-photo-form.*>/gi) &&
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code.match(/<form.*cat-photo-form.*>/gi).length > 0
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);
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```
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No debes asignar a tu `form` ningún atributo `class` o `style`.
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```js
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assert(!code.match(/<form.*style.*>/gi) && !code.match(/<form.*class.*>/gi));
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```
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# --seed--
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## --seed-contents--
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```html
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<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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<style>
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.red-text {
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color: red;
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}
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h2 {
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font-family: Lobster, monospace;
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}
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p {
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font-size: 16px;
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font-family: monospace;
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}
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.thick-green-border {
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border-color: green;
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border-width: 10px;
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border-style: solid;
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border-radius: 50%;
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}
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.smaller-image {
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width: 100px;
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}
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.silver-background {
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background-color: silver;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img class="smaller-image thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div class="silver-background">
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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" id="cat-photo-form">
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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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# --solutions--
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```html
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<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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<style>
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.red-text {
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color: red;
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}
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h2 {
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font-family: Lobster, monospace;
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}
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p {
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font-size: 16px;
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font-family: monospace;
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}
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.thick-green-border {
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border-color: green;
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border-width: 10px;
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border-style: solid;
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border-radius: 50%;
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}
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.smaller-image {
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width: 100px;
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}
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.silver-background {
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background-color: silver;
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}
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#cat-photo-form {
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background-color: green;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img class="smaller-image thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div class="silver-background">
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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" id="cat-photo-form">
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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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