An internal CSS is used to define a style for a single HTML page.
Other than external stylesheet, adding style every inline element becomes hard to manage and also sometimes style is repeated.
Inline CSS is added into style element defined n head element. The syntax is as followed:
tagname { property1: value1; property2: value2; }
<head>
<style>
p {
color: #fff;
background-color: #3f51b5
}
</style>
</head>
<body>
<p>Internal CSS styled text line</p>
</body>
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