<div class="mover">drag</div>
@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;  
  font-family: Pretendard;
}

body {
  width: 100vw;
  height: 100vh;
}

div {
  width: 100px;
  height: 125px;
  background: #febf00;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.3rem;
  font-weight: bold;
  border-radius: 2px;
  
  position: absolute;
  left: 50px;
  top: 50px;
  
  user-select: none;
  
  /*  drag cursor   */
  cursor: grab;
}

div:active {
  cursor: grabbing;
}
const draggable = ($target) => {
  let isPress = false,
      prevPosX = 0,
      prevPosY = 0;
  
  $target.onmousedown = start;
  $target.onmouseup = end;
    
  // 상위 영역
  window.onmousemove = move;
 
  function start(e) {
    prevPosX = e.clientX;
    prevPosY = e.clientY;

    isPress = true;
  }

  function move(e) {
    if (!isPress) return;

    const posX = prevPosX - e.clientX; 
    const posY = prevPosY - e.clientY; 
    
    prevPosX = e.clientX; 
    prevPosY = e.clientY;
    
    $target.style.left = ($target.offsetLeft - posX) + "px";
    $target.style.top = ($target.offsetTop - posY) + "px";
  }

  function end() {
    isPress = false;
  }
}

window.onload = () => {
  const $target = document.querySelector(".mover");
  
  draggable($target);
}

External CSS

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External JavaScript

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