CSS Rules consist of two main parts: Selector and one or more declarations.
Selector {Declaration1; Declaration2;... declarationn}
The selector is usually an HTML element that you need to change the style.
Each statement consists of an attribute and a value.
Property is the style attribute you want to set. Each attribute has a value, which is separated by colons.
Selector {property: Value}
The following code defines the text color in the H1 element as red, and sets the font size to 14 pixels.
H1 {color: red; font-size: 14px ;}
Internal style sheet:
When a document requires a special style, you should use an internal style sheet. You can use the <style> label to define the internal style sheet in the document header.
Example:
Webpage.html
<HTML>
<Head>
<Style type = "text/CSS">
Body {background-color: yellow}
</Style>
</Head>
<Body>
</Body>
</Html>
Effect:
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