Fix PHP, CSS AND JS coding standards

sass/modules/_accessibility.scss

@@ -19,8 +19,10 @@
 		clip-path: none;
 		color: $color__text-screen;
 		display: block;
+
 		@include font-size(0.875);
-		font-weight: bold;
+
+		font-weight: 700;
 		height: auto;
 		left: 5px;
 		line-height: normal;

sass/modules/_alignments.scss

@@ -14,6 +14,8 @@
 
 .aligncenter {
 	clear: both;
+
 	@include center-block;
+
 	margin-bottom: 1.5em;
 }

sass/modules/_clearings.scss

@@ -1,23 +1,25 @@
-.clear:before,
-.clear:after,
-.entry-content:before,
-.entry-content:after,
-.comment-content:before,
-.comment-content:after,
-.site-header:before,
-.site-header:after,
-.site-content:before,
-.site-content:after,
-.site-footer:before,
-.site-footer:after {
+.clear::before,
+.clear::after,
+.entry-content::before,
+.entry-content::after,
+.comment-content::before,
+.comment-content::after,
+.site-header::before,
+.site-header::after,
+.site-content::before,
+.site-content::after,
+.site-footer::before,
+.site-footer::after {
+
 	@include clearfix;
 }
 
-.clear:after,
-.entry-content:after,
-.comment-content:after,
-.site-header:after,
-.site-content:after,
-.site-footer:after {
+.clear::after,
+.entry-content::after,
+.comment-content::after,
+.site-header::after,
+.site-content::after,
+.site-footer::after {
+
 	@include clearfix-after;
 }

sass/modules/_infinite-scroll.scss

@@ -1,10 +1,11 @@
-/* Globally hidden elements when Infinite Scroll is supported and in use. */
-.infinite-scroll .posts-navigation, /* Older / Newer Posts Navigation (always hidden) */
-.infinite-scroll.neverending .site-footer { /* Theme Footer (when set to scrolling) */
+/* Hide the Older / Newer Posts Navigation when Infinite Scroll is in use. */
+.infinite-scroll .posts-navigation,
+/* Hide the Theme Footer (when set to scrolling) */
+.infinite-scroll.neverending .site-footer {
 	display: none;
 }
 
-/* When Infinite Scroll has reached its end we need to re-display elements that were hidden (via .neverending) before. */
+/* Re-display the Theme Footer when Infinite Scroll has reached its end. */
 .infinity-end.neverending .site-footer {
 	display: block;
 }