how to write css in html
<!-- External CSS -->
<!-- External styles are defined within the <link> element, inside the <head> section of an HTML page: -->
<!--
body {
background-color: lightblue;
}
h1 {
margin-left: 20px;
}
-->
<head>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
<body>
<h1>Heading Text</h1>
</body>
<!-- Internal CSS -->
<!-- Internal styles are defined within the <style> element, inside the <head> section of an HTML page: -->
<head>
<style>
body {
background-color: linen;
}
h1 {
color: maroon;
margin-left: 40px;
}
</style>
</head>
<body>
<h1>Heading text</h1>
</body>
<!-- Inline CSS -->
<!-- Inline styles are defined within the "style" attribute of the relevant element: -->
<body>
<h1 style="color:blue;text-align:center;">Heading Text</h1>
<p style="color:red;">Paragraph Text.</p>
</body>