What does css class mean?

css class means class selector, which is used to select elements with specified classes; the class selector is displayed with a dot, and its usage syntax is such as ".center {text-align: center}", This statement means that all HTML elements with the center class are centered.

The operating environment of this tutorial: windows7 system, HTML5&&CSS3 version, Dell G3 computer.

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In css, class refers to the class (class) selector, which is used to select elements with a specified class (class) ;The class selector is displayed with a period, such as ".center".

.center {text-align: center}

In the above example, all HTML elements with the center class are centered.

In the HTML code below, both h1 and p elements have the center class. This means that both will obey the rules in the ".center" selector.

<h1 class="center">
This heading will be center-aligned
</h1>
<p class="center">
This paragraph will also be center-aligned.
</p>

Note: Numbers cannot be used as the first character of the class name! It won't work in Mozilla or Firefox.

Like id, class can also be used as a derived selector:

.fancy td {
color: #f60;
background: #666;
}

In the above example, the table cells inside the larger element with the class name fancy will have a gray background Orange text is displayed. (A larger element named fancy might be a table or a div)

Elements can also be selected based on their class:

td.fancy {
color: #f60;
background: #666;
}
<td class="fancy">

In the above example, the class name fancy table cells will be orange with a gray background.

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