A CSS class is a line of code in your CSS file which corresponds to the HTML equivalent of that class; it is defined with a dot: "."
<div class="test">This is a test.</div>
CSS:
.test { display: block; background: #f90; color: #fff; }
The classes are used to define the style for the individual element of the web page or to determine different styles for the one tag. Syntax for the classes will be the following:
Tag.Name of class { property1: value; property2: value; ... }
Inside of the style sheet the desirable tag is written first, than, after the semicolon - the user's class name. In order to define in HTML code the fact, that tag with the definite style is used, parameter is added to the tag
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Class defines the element's style. That way, when you have multiple elements which has the same look and style, you don't have to repeat typing in the code for style.
Example
<head>
<style>
span.blue{background-color:#0000ff;}
(.blue is the class)
</style>
</head>
<body>
<span class="blue">Blue</span>
</body>
A class in CSS could be used to refer a value. A dot symbol is used to refer a class anywhere in program.
"class" is an attribute of most if not all HTML tags. To apply a CSS class to a tag, simply make the class attribute equal to that CSS class. For example, suppose you have a CSS class called bigRed that makes text large and red. If you want to apply it to a certain text, just put it in a tag surrounding that text. e.g. . . . but my <span class='bigRed' >car</span> was faster than . . .
Using CSS class in a body section is called inline style. You can use styles inside most HTML tags.
All CSS is custom, that is the purpose behind CSS. It allows you to control the presentation of your web pages and separate the rules that govern presentation from the content and markup. You control what rules you develop and set the rules for. CSS stands for cascading style sheets.
to modify any HTML tag just type the tag as the css property eg. ul { /*your css here*/ }
The easiest thing is to use a class. Add class="foo" to your elements. And add this code to your CSS:.foo {border: solid 1px #000000;//Or something like that.}