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how to call this class<br />

<pre><code id="code-10-28019924-1">.error{
background-color: #F2DEDE;
				    border-color: #EED3D7;
				    border-radius: 4px 4px 4px 4px;
				    color: #B94A48;
				    margin-bottom: 20px;
				    padding: 8px 35px 8px 14px;
				    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
}
                                            </code></pre>
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what are the different ways to call this error box class

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.