Posandu/index.html

## index.html
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        body {
            padding: 100px;
            background-color: #2b3438;
        }

        .btn {
            background: #37474f;
            border: none;
            padding: 10px 16px;
            font-family: system-ui;
            border-radius: 4px;
            color: white;
            font-weight: 400;
            position: relative;
            overflow: hidden;
            transition: all 0.2s ease;
        }

        .btn:hover {
            background: #3f51b5;
        }

        .btn:active {
            box-shadow: -2px 2px 2px rgba(0, 0, 0, 0.2);
        }


        .ripple {
            position: absolute;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.151);
            transform: scale(0);
            animation: ripple 0.6s cubic-bezier(0.075, 0.82, 0.165, 1) forwards;
            pointer-events: none;
            transition: all 0.2s ease;
        }

        @keyframes ripple {
            0% {
                transform: scale(0);
            }

            100% {
                transform: scale(1);
            }
        }
    </style>
</head>

<body>

    <button class="btn">
        Button
    </button>


    <script>
        const btn = document.querySelector('.btn');

        const attachRipple = element => {
            let circle;
            let rippling = false;

            const findFurthestPoint = (clickPointX, elementWidth, offsetX, clickPointY, elementHeight, offsetY) => {
                const x = clickPointX - offsetX > elementWidth / 2 ? 0 : elementWidth;
                const y = clickPointY - offsetY > elementHeight / 2 ? 0 : elementHeight;
                const d = Math.hypot(x - (clickPointX - offsetX), y - (clickPointY - offsetY));
                return d;
            }

            element.onpointerdown = (e) => {
                if (rippling) return;
                rippling = true;

                const rect = e.target.getBoundingClientRect();
                const radius = findFurthestPoint(e.clientX, e.target.offsetWidth, rect.left, e.clientY, e.target.offsetHeight, rect.top);

                circle = document.createElement("div");
                circle.classList.add("ripple");

                circle.style.left = e.clientX - rect.left - radius + "px";
                circle.style.top = e.clientY - rect.top - radius + "px";
                circle.style.width = circle.style.height = radius * 2 + "px";

                e.target.appendChild(circle);
            }

            "pointerup mouseleave dragleave touchmove touchend touchcancel".split(" ").forEach(event => {
                element.addEventListener(event, () => {
                    if (circle) {
                        // Remove ripple after animation is finished
                        setTimeout(() => {
                            circle.style.opacity = 0;
                            rippling = false;
                        }, 200);
                    }
                });
            });
        }

        attachRipple(btn);


    </script>
</body>

</html>
	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<style>
	body {
	padding: 100px;
	background-color: #2b3438;
	}

	.btn {
	background: #37474f;
	border: none;
	padding: 10px 16px;
	font-family: system-ui;
	border-radius: 4px;
	color: white;
	font-weight: 400;
	position: relative;
	overflow: hidden;
	transition: all 0.2s ease;
	}

	.btn:hover {
	background: #3f51b5;
	}

	.btn:active {
	box-shadow: -2px 2px 2px rgba(0, 0, 0, 0.2);
	}


	.ripple {
	position: absolute;
	border-radius: 50%;
	background-color: rgba(255, 255, 255, 0.151);
	transform: scale(0);
	animation: ripple 0.6s cubic-bezier(0.075, 0.82, 0.165, 1) forwards;
	pointer-events: none;
	transition: all 0.2s ease;
	}

	@keyframes ripple {
	0% {
	transform: scale(0);
	}

	100% {
	transform: scale(1);
	}
	}
	</style>
	</head>

	<body>

	<button class="btn">
	Button
	</button>



	<script>
	const btn = document.querySelector('.btn');

	const attachRipple = element => {
	let circle;
	let rippling = false;

	const findFurthestPoint = (clickPointX, elementWidth, offsetX, clickPointY, elementHeight, offsetY) => {
	const x = clickPointX - offsetX > elementWidth / 2 ? 0 : elementWidth;
	const y = clickPointY - offsetY > elementHeight / 2 ? 0 : elementHeight;
	const d = Math.hypot(x - (clickPointX - offsetX), y - (clickPointY - offsetY));
	return d;
	}

	element.onpointerdown = (e) => {
	if (rippling) return;
	rippling = true;

	const rect = e.target.getBoundingClientRect();
	const radius = findFurthestPoint(e.clientX, e.target.offsetWidth, rect.left, e.clientY, e.target.offsetHeight, rect.top);

	circle = document.createElement("div");
	circle.classList.add("ripple");

	circle.style.left = e.clientX - rect.left - radius + "px";
	circle.style.top = e.clientY - rect.top - radius + "px";
	circle.style.width = circle.style.height = radius * 2 + "px";

	e.target.appendChild(circle);
	}

	"pointerup mouseleave dragleave touchmove touchend touchcancel".split(" ").forEach(event => {
	element.addEventListener(event, () => {
	if (circle) {
	// Remove ripple after animation is finished
	setTimeout(() => {
	circle.style.opacity = 0;
	rippling = false;
	}, 200);
	}
	});
	});
	}

	attachRipple(btn);


	</script>
	</body>

	</html>