$myFont: Helvetica, sans-serif;
$myColor: red;
$myFontSize: 18px;
$myWidth: 680px;
body {
font-family: $myFont;
font-size: $myFontSize;
color: $myColor;
}
#container {
width: $myWidth;
}
body {
font-family: Helvetica, sans-serif;
font-size: 18px;
color: red;
}
#container {
width: 680px;
border: 1px blue double;
}
<!DOCTYPE html>
<html>
<link rel="stylesheet" href="mystyle.css">
<body>
<h1>Hello World</h1>
<p>This is a paragraph.</p>
<div id="container">This is some text inside a container.</div>
</body>
</html>