如果我们的屏幕尺寸也很小，那么在将标记拖放到特定位置后必须将其拖放的标记存在问题
<div class="floor-map-img-upload">
<img src="assets/floor-map-icon.png">
<h5>Upload floor map image<br/>
(600px*600px)</h5>
<button type="button" id="upload_image" class="btn btn-floor-imgg">Choose</button>