Display Grid for IE11

Question

I’m making a grid with the 7 items according to the code below:

My code

nav div.grade {
    display: grid;
    grid-template-columns: auto auto auto auto;
    margin-top: 5px;
    display: -ms-grid;
    -ms-flex-direction: column;
    -ms-grid-auto-columns: 100px;

}

nav div.iten_grade {
    width: 220px;
    background-color: #d6d6d6;
    text-align: center;
    height: 40px;
    justify-content: center;
    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    -o-justify-content: center;

    align-items: center;
    -webkit-align-items: center;
    -moz-align-items: center;
    -ms-align-items: center;
    -o-align-items: center;

    border-radius: 10px;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    -ms-border-radius: 10px;
    -o-border-radius: 10px;
    margin: 10px 45px 0px 45px;
    /*Compatibilidade */
    display: -webkit-flex;
    display: -moz-flex;
    display: -ms-grid;
    display: -o-flex;
    display: flex;
    color: #555555;
    -ms-float: right;
}

<div class="grade">
  <div class="iten_grade">
          <a href="#">1</a>
        </div>
       <div class="iten_grade">
          <a href="#">1</a>
        </div>
  <div class="iten_grade">
          <a href="#">1</a>
        </div>
  <div class="iten_grade">
          <a href="#">1</a>
        </div>
  <div class="iten_grade">
          <a href="#">1</a>
        </div>
  <div class="iten_grade">
          <a href="#">1</a>
        </div>
  <div class="iten_grade">
          <a href="#">1</a>
        </div>
</div>

In other words, I’m making a menu at the bottom of the page, I like the customer, within a fieldset basically according to image:

So far so good, but the problem is that I came across customers who use IE11 that just doesn’t have compatibility. Even using -ms- the browser does not accept. Other browsers accepted: Chrome, Firefoz, Edge (Safari and Opera I will still test).

Is there another way for compatibility? There are unique compatibility tags for IE11?

Sorry if the text got confused!