dragNdrop.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }

        body {
            background: rgba(14, 13, 13);
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            overflow: hidden;
            margin: 0;
        }

        .empty {
            height: 200px;
            width: 200px;
            margin: 10px;
            border: 3px solid white;
            background: white;
        }

        .fill {
            background: url(images/space/water-circle.jpg);
            background-position: center;
            background-size: cover;
            height: 195px;
            width: 195px;
            cursor: pointer;
        }

        /* Javascript */

        .hovered {
            background: rgb(0, 255, 0);
            border: 3px dashed white;
        }

        @media (max-width:800px) {
            body {
                flex-direction: column;
            }
        }
    </style>
</head>

<body>
    <div class="empty">
        <div class="fill" draggable="true"></div>
    </div>

    <div class="empty"></div>
    <div class="empty"></div>
    <div class="empty"></div>
    <div class="empty"></div>

    <script>
        const fill = document.querySelector(".fill"),
            empties = document.querySelectorAll(".empty")

        fill.addEventListener("dragstart", dragStart)
        fill.addEventListener("dragend", dragEnd)

        for (const empty of empties) {
            empty.addEventListener("dragover", dragOver)
            empty.addEventListener("dragenter", dragEnter)
            empty.addEventListener("dragleave", dragLeave)
            empty.addEventListener("drop", dragDrop)
        }

        function dragStart() {
            setTimeout(() => {
                this.className = "Invisible"
            }, 0)
        }
        function dragEnd() {

            this.className = "fill"

        }
        function dragOver(e) {

            e.preventDefault()

        }
        function dragEnter(e) {

            e.preventDefault()
            this.className += " hovered"

        }
        function dragLeave() {

            this.className = "empty"

        }
        function dragDrop() {

            this.className = "empty"
            this.append(fill)

        }
    </script>
</body>

</html>