JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.modal-footer {
  background-color: #2A3E5D;
  color: white;
  height: 100px;
  padding: 2px 16px;
  display:table;
  width: 100%;
}
.wrapper-div {
  display:table-cell; 
  vertical-align: middle;
}
.button {
  background: #e8e8e8;
  display: block;
  margin:auto;
  font-size: 12px
  position: relative;
}