This code will increase font size to 90 px. 3em means multiply to 300 %.
...
<head>
<style>
body {
font-size: 30px;
}
</style>
</head>
<body>
<div style="font-size: 3em;">How big am I?</div>
</body>
...
This code will increase font size to 90 px. 3em means multiply to 300 %.
...
<head>
<style>
body {
font-size: 30px;
}
</style>
</head>
<body>
<div style="font-size: 3em;">How big am I?</div>
</body>
...