Vertical align middle button in div [duplicate]

Question

I am trying to vertically align this button in the center of the modal-footer div. Here is a link to my JSFiddle: https://jsfiddle.net/kris_redden/34jyLpok/

.modal-footer {
  background-color: #2A3E5D;
  color: white;
  height: 100px;
  padding: 2px 16px;
}

.wrapper-div {
  vertical-align: middle
}

.button {
  background: #e8e8e8;
  display: inline-block;
  font-size: 12px position: relative;
}

<div class="modal-footer">
  <div class="wrapper-div">
    <button type="button" class="button"> Submit Filters </button>
  </div>
</div>

I'm not sure what needs to change in order for this to be vertically aligned in the center of the blue modal-footer div. I know can accomplish this in a hacky way by putting margins on the button but that isn't what I want to do.

Answer 1

Easiest would be to add the following to .modal-footer

display: flex; align-items: center; 

Answer 2

this can also be achieved by using

.button-container{
 position:relative;
 height:100%;
}

.button{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

vertical-align:middle; is not necessary here. i would use this method if button container height is unknown and if i could not use flex-box (dispaly:flex;) instead.
https://jsfiddle.net/34jyLpok/7/

another option is to use flex-box (display:flex;)

.button-container{
     height:100%;
     display: flex;
     //flex-direction: column;//only vertical
     align-items: center;//both vertical and horizonal
     justify-content: center
    }

    .button{
      width:100px;
    }

the problem with display: flex is that it is not fully supported in old IE browser versions. https://jsfiddle.net/34jyLpok/9/