Animated instructions with transitional background effects

A nifty dynamic indicator effect

An animation indicating effect with transition background effect implemented using css and js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title></title>
    <style>
        html, body { height: 100%; }

        body {
            font-family: 'microsoft yahei',Arial,sans-serif;
            margin: 0;
            background: radial-gradient(#666, #222);
        }
        .button {
            position: absolute;
            left:50%; top:50%;
            width:140px; height:140px;
            margin:-70px 0 0 -70px;
            cursor: pointer;
        }
        .compass {
            position: absolute;
            width:100%; height:100%;
            background: #444;
            border-radius: 0 50% 50% 50%;
            border: 10px solid white;
            box-shadow: 0 0 8px rgba(0,0,0,.2);
            border-right-color: coral;
            border-bottom-color: coral;
            transition: border-radius .2s;
            box-sizing: border-box;
        }
        .button:hover .compass {
            border-radius: 50%;
        }
        .msg {
            position: absolute;
            width:100%; height:100%;
            line-height: 140px;
            text-align: center;
            color: #fff;
            font-size: 20px;
            font-weight: 300;
        }
    </style>
</head>
<body>
<div class="button">
    <div class="compass"></div>
    <div class="msg">Look here!</div>
</div>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
    $(document).on('mousemove', function(e) {
        var x = e.pageX;
        var y = e.pageY;
        var w = $(this).width();
        var h = $(this).height();
        var angle = Math.atan2 (y- (h / 2), x- (w / 2)) * (180 / Math.PI);
        var rotate = angle + (180-45);
        $('.button .compass')
                .css('-webkit-transform', 'rotate('+rotate+'deg)')
                .css('-moz-transform', 'rotate('+rotate+'deg)')
                .css('-ms-transform', 'rotate('+rotate+'deg)')
                .css('-o-transform', 'rotate('+rotate+'deg)')
                .css('transform', 'rotate('+rotate+'deg)');
    });
</script>
</body>
</html>

Animated instructions with transitional background effects

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