earts(container) {
        // create 5 hearts
        for (let i = 0; i < 15; i++) {
          setTimeout(() => {
            const heart = document.createElement("span");
            heart.classList.add("heart");
            heart.innerHTML = '<i class="fas fa-heart"></i>';
            heart.style.left = Math.random() * 100 + "%";
            heart.style.top = Math.random() * 100 + "%";
            heart.style.fontSize = Math.random() * 20 + 5 + "px";
            heart.style.animationDuration = M