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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <h1>Classes and IDs</h1>

<p>Say we have a notification to style, with an id of <code>notification</code>.<p>

<div id="notification">
  This has an <strong>id</strong> of <code>notification</code>, so it is selected in CSS with <code>#notification</code>. Check it out.

<p>But what if we have many messages on the page which are meant to look similar?</p>

<div class="message">
  This is in an element with a <strong>class</strong> of <code>message</code>, so it can be selected in CSS with <code>.message</code>.

<div class="message">
  This is in another element with a <strong>class</strong> of <code>message</code>, so it gets styled too.

<div class="message">
  A third element with a <strong>class</strong> of <code>message</code>, for good measure. One CSS selector styles all of these.

<h2>IDs are singular, Classes are plural</h2>

<p>An ID is meant to be used only once in a given HTML document. A given element can have only one ID.</p>

<p>A class can be reused as many times as needed in a given HTML document. A given element can have multiple classes.</p>

<h2>Using Multiple Classes</h2>

<p>An element can be given multiple classes, separated by spaces, such as <code>class="foo bar baz"</code>.</p>

<div class="message error">
  This has <code>class="message error"</code>, meaning it has two classes: <code>message</code> and <code>error</code>. It will get styles from <code>.message</code> and <code>.error</code>. The styles for <code>.error</code> override the default styles, which we achieve by placing them after the styles for <code>.message</code>.

<h2>Your Turn</h2>

<p>Add a new element to the page below the error message, that will serve as a success message, and style it to be green.</p>
              body {
  font-family: sans-serif;
  line-height: 1.4;
  margin: 30px;

#notification {
  background: #EEE;
  padding: 10px;
  border: 1px solid #CCC;

.message {
  background: #FFE;
  padding: 15px;
  border: 2px solid #CCB;
  margin: 10px 0;

.error {
  background: #FEE;
  border-color: #C66;

code {
  background: rgba(0,0,0,.05);
  padding: 1px 4px;
  border: 1px solid rgba(0,0,0,.2);
  border-radius: 4px;
  margin: 0 1px;
  white-space: nowrap;
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