<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>

* {
  box-sizing: border-box;
}

body {
  background-color: steelblue;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

.empty {
  height: 150px;
  width: 150px;
  margin: 10px;
  border: solid 3px black;
  background: white;
}

.fill {
  background-image: url('https://mankeung.github.io/docs/mk-data/assets/logo.png');
  background-size: 100% 100%;
  height: 145px;
  width: 145px;
  cursor: pointer;
}

.hold {
  border: solid 5px #ccc;
}

.hovered {
  background-color: #333;
  border-color: white;
  border-style: dashed;
}

@media (max-width: 800px) {
  body {
    flex-direction: column;
  }
}

const fill = document.querySelector('.fill')
const 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() {
    this.className += ' hold' 
    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)
}