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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