Como vincular o CSS ao HTML
<link rel="stylesheet" href="styles.css">
Unusual Unicorn
<link rel="stylesheet" href="styles.css"><head>
<link rel="stylesheet" href="styles.css">
</head><!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" src="style.css">
</head>
<body>
</body>
</html><head>
<link href="style.css" rel="stylesheet">
<title>Hello World!!</title>
</head><head>
<link rel="stylesheet" href="[name of css file]"
</head>// You can pass mutliple links into the urls using an array as well
browser.windows.create({url: "google.com"});