PHP file to randomly generate a color palette

color_generator.php

<style>
div {
	float: left;
	width: 12.5%;
	padding: 40px 0;
	line-height: 30px;
	text-align: center;
	color: #fff;
	font-family: Verdana;
}
</style>

<?php

if (isset($_GET['amount'])) {
	$amount = $_GET['amount'];
} else {
	$amount = 40;
}

$colors = [];
for ($i = 0 ; $i < $amount ; $i++) {
	$colors[] = [rand(0, 255), rand(0, 255), rand(0, 255)];
}

foreach($colors as $color) {
	$rgba = 'rgba(' . $color[0] . ', ' . $color[1] . ', ' . $color[2] . ', 1)';
	print '<div style="background-color:' . $rgba . '">' . $rgba . '</div>';
}
?>