Bootstrap V4模式效果背景不稳定

Question

enter image description here模式打开与窗体URL栏。当用户点击一个栏时，Modal会打开URL栏和网站名称。现在问题是当模式打开并且用户将光标移动到打开栏的区域时，背景栏会变成白色或打扰。

引导代码，我试图

<div class="container-fluid"> 

    <!-- Form trigger modal --> 
<form action="testiing bars.php" method="get" data-toggle="modal" data-target="#formModal"> 
    <div class="form-group"> 
    <label for="inputlg"></label> 
    <input class="form-control input-lg" id="inputlg" type="text" name="website"> 
    </div> 
</form> 

<!-- Modal --> 
<div class="modal fade" id="formModal" tabindex="-1" role="dialog" aria-labelledby="formModal" aria-hidden="true"> 
    <div class="modal-dialog" role="document"> 
    <div class="modal-content"> 
     <div class="modal-header"> 
     <h5 class="modal-title" id="exampleModalLongTitle">Submit URL</h5> 
     <button type="button" class="close" data-dismiss="modal" aria-label="Close"> 
      <span aria-hidden="true">&times;</span> 
     </button> 
     </div> 
     <div class="modal-body"> 
     ... 
     </div> 
     <div class="modal-footer"> 
     <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button> 
     </div> 
    </div> 
    </div> 
</div> 

不知道如何解决这个问题？

Answer 1

我用添加背景滚动到弹出的可用性功能的代码，可能会有所帮助：

/*allow modal scroll behind*/ 
html { overflow-y: scroll !important; } 
body .modal-open { overflow: visible; }