<html>
<head>
<style>
#grad {
height: 50px;
width: 50px;
background: conic-gradient(at -10px -10px, blue 0deg, blue 90deg, orange 90deg, orange 180deg, green 180deg, green 270deg, blue 270deg, blue 360deg);
}
</style>
</head>
<body>
<div id="grad"></div>
</body>
</html>