Thanks for the suggestions. I figured out where to add the code this morning. The old ‘hit & miss’ method! I actually think I may have made this exact change yesterday but neglected to refresh my browser leading me to believe, of course, that the change hadn’t worked.
.widget-area .widget h3 {
text-align: center;
margin-bottom: 24px;
margin-bottom: 1.714285714rem;
}