<style>
p {
margin-left: 50px;
margin-right: 20px;
font-family: <?php echo $_GET['font-family'] ?>;
color: <?php echo $_GET['color'] ?>;
font-size: <?php echo $_GET['font-size'] ?>;
font-weight: <?php echo $_GET['font-weight'] ?>;
font-style: <?php echo $_GET['font-style'] ?>;
line-height: <?php echo $_GET['line-height'] ?>;
letter-spacing: <?php echo $_GET['letter-spacing'] ?>;
text-transform: <?php echo $_GET['text-transform'] ?>;
font-variant: <?php echo $_GET['font-variant'] ?>;
text-shadow: <?php echo $textShadow ?>;
}
body {
margin: 20px 0;
background: #fff;
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
body.dark {
background: #333;
}
</style>
....
<body class='<?php echo $_GET['dark'] ?>'>
