Social Links menu mobile centering styles.

stratford/sass/_extra-child-theme.scss

@@ -338,4 +338,7 @@ body {
 		top: 0;
 		right: 0;
 	}
+	.social-links-menu {
+		justify-content: center;
+	}
 }

stratford/style-rtl.css

@@ -3635,6 +3635,10 @@ input[type="submit"].has-background:visited,
 }
 
 @media only screen and (max-width: 559px) {
+	#masthead {
+		max-height: 100%;
+		overflow-y: scroll;
+	}
 	.site-header {
 		position: relative;
 		padding-left: 32px;

stratford/style.css

@@ -3658,4 +3658,7 @@ input[type="submit"].has-background:visited,
 		top: 0;
 		right: 0;
 	}
+	.social-links-menu {
+		justify-content: center;
+	}
 }