<html>
<head>
    <style>
        #grad {
            height: 100px;
            width: 100px;
            background: repeating-conic-gradient(
                  blue 0deg, blue 90deg,
                  orange 0deg, orange 180deg
              );
        }
    </style>
</head>
<body>
    <div id="grad"></div>
</body>
</html>