I noticed that when I tried to place in a css style like this one from the style sheet nothing happens. I had to do it in the style sheet itself. I haven’t mastered the child theme just yet and wanted to pass this along. This happens to any style I add in to the custom css section in the backend. I did the update for the theme and still have that issue.
#primary-menu > ul.menu > li > a {
color: #fff;
display: block;
float: left;
font-size: 11px;
font-weight: 600;
line-height: 1.7em;
padding: 50px 20px 10px;
text-transform: uppercase;
}