Centering menu in Hemingway theme

I know there are a million topics about this, but nothing I’ve tried has worked.

I’m trying to center the menu, which currently aligns left. The code for the navigation menu is:

.blog-menu li { position: relative; }
.blog-menu > li { float: left; }

.blog-menu > li:before {
	content: "/";
	display: block;
	position: absolute;
	left: 0;
	top: 50%;
	margin-top: -9px;
	margin-left: -3px;
	font-size: 16px;
	color: #444;
	font-weight: 300;
	z-index: 1000;
}

.blog-menu > li:first-child:before { content: none; }

.blog-menu a {
	display: block;
	padding: 27px 20px;
	text-transform: uppercase;
	letter-spacing: 1px;
	color: rgba(255,255,255,0.4);
	font-size: 13px;
}

.blog-menu a:hover,
.blog-menu .current-menu-item a { color: #FFF; }

.blog-menu > .has-children a,
.blog-menu > .page_item_has_children a { padding-right: 35px; }

.blog-menu > .has-children::after,
.blog-menu > .page_item_has_children::after {
	content: "";
	display: block;
	border: 5px solid transparent;
	border-top-color: rgba(255,255,255,0.4);
	position: absolute;
	z-index: 1001;
	right: 17px;
	top: 50%;
	margin-top: -2px;
}

.blog-menu > .has-children:hover::after,
.blog-menu > .page_item_has_children:hover::after { border-top-color: #FFF; }

.blog-menu li:hover a {
	background-color: #1D1D1D;
	cursor: pointer;
}

.blog-menu li:hover > a { color: #FFF; }

However, I could be looking in the wrong place. I’m new at this. I’m just not sure where else the changes should go. I also am already using a child theme.

The link to my site is https://www.therailyardloft.com. Can anyone help me out?