Actually, my web page has 2 **div** tags which are vertically separated using **col-md** values. Its like `<div class="col-md-6">` and `<div class="col-md-6">`. Right now both the divs are aligned side-by-side. [![enter image description here](https://i.stack.imgur.com/eX6PY.png)](https://i.stack.imgur.com/eX6PY.png). 

But when I minimize the browser window, then both the divs are aligned one by one.[![enter image description here](https://i.stack.imgur.com/UZtiy.png)](https://i.stack.imgur.com/UZtiy.png)

Code Snippet here:

```html
<div class="container">
  <div class="row">
    <div class="col-md-6"> 
        <div class="panel panel-info">
   <div class="panel-heading text-center">
    <div class="panel-title"><strong>Virtual Document 1</strong></div>
   </div>
        </div>

        <div class="panel-body" style="max-height: 10; ">
          <ay-treeTable [value]="node1" selectionMode="multiple" (onNodeSelect) = "selectedLeftNode($event)">
              <ay-column field="name" header="Name" ></ay-column>
              <ay-column field="id" header="Id" [style]="{'width': '130px'}" ></ay-column>
              <ay-column field="versionLabel" header="Version" [style]="{'width': '70px'}"></ay-column>
          </ay-treeTable>
        </div>
    </div>
 <div class="col-md-6"> 
        <div class="panel panel-info">
          <div class="panel-heading text-center">
            <div class="panel-title " ><strong>Virtual Document 2</strong></div>
          </div>
        </div>
        <div class="panel-body" style="max-height: 10; ">
          <ay-treeTable [value]="node2" selectionMode="multiple" (onNodeSelect) = "selectedRightNode($event)" >
              <ay-column field="name" header="Name"></ay-column>
              <ay-column field="id" header="Id" [style]="{'width': '130px'}"></ay-column>
              <ay-column field="versionLabel" header="Version" [style]="{'width': '70px'}"></ay-column>
          </ay-treeTable>
        </div>
    </div>
  </div>
</div>
```

My question, could anyone suggest me how to retain the position of the divs?