Why Use CSS?
CSS is used to define styles for your web pages, including the design, layout and variations in display for different devices and screen sizes.

CSS for Example syntax -> w3school, iterumque! There are three ways of inserting a style sheet:

External CSS
Internal CSS
Inline CSS

External CSS

External styles are defined within the link element, inside the headsection of an HTML page:

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
</head>
<body>

<h1>This is a heading</h1>
<p>This is a paragraph.</p>

</body>
</html>

Here is how the "style.css" file looks: must be saved with a .css extension / file should not contain any HTML tags

body {
background-color: lightblue;
    }

h1 {
color: navy;
margin-left: 20px;
}

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Internal CSS

An internal style sheet may be used if one single HTML page has a unique style

<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: linen;
}

h1 {
color: maroon;
margin-left: 40px;
        }
    </style>
    </head>
        <body>
     <h1>This is a heading</h1>
<p>This is a paragraph.</p>

</body>
</html>

Inline CSS

Inline styles are defined within the "style" attribute of the relevant element:

<!DOCTYPE html>
<html>
<body>

<h1 style="color:blue;text-align:center;">This is a heading</h1>
<p style="color:red;">This is a paragraph.</p>

</body>
</html>

CSS allows animation of HTML elements without using JavaScript or Flash!

The @keyframes Rule

When you specify CSS styles inside the @keyframes rule, the animation will gradually change from the current style to the new style at certain times.

<!DOCTYPE html>
<html>
<head>
<style> 
div {
width: 100px;
height: 100px;
background-color: red;
animation-name: example;
animation-duration: 4s;
}

@keyframes example {
from {background-color: red;}
to {background-color: yellow;}
}
</style>
</head>
<body>

<p><b>Note:</b> It will not work in Internet Explorer 9 and earlier versions.</p>
</body>
</html>

Create a Basic Mobile Page

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tiffWord(snippetAnimatedCd);
wrap_exbibyte = cropStation;
if (page(mailDvCybersquatter, error, ip)) {
    xsltMacintosh += ip;
} else {
    social += traceroute_redundancy_voip;
    box_isp.lion = wepSuffix;
}

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<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3pro.css">
<body>

<!-- Content here -->

</body>
</html>