Fix margin auto bug.

spearhead/assets/sass/_posts-and-pages.scss

@@ -24,7 +24,7 @@
 }
 
 .site-main > * {
-	margin: 0;
+	margin: 0 auto;
 	padding: calc(3 * var(--global--spacing-vertical)) 0;
 }
 

spearhead/style-rtl.css

@@ -53,7 +53,7 @@ Tags: one-column, flexible-header, accessibility-ready, custom-colors, custom-me
 }
 
 .site-main > * {
-	margin: 0;
+	margin: 0 auto;
 	padding: calc(3 * var(--global--spacing-vertical)) 0;
 }
 

spearhead/style.css

@@ -53,7 +53,7 @@ Tags: one-column, flexible-header, accessibility-ready, custom-colors, custom-me
 }
 
 .site-main > * {
-	margin: 0;
+	margin: 0 auto;
 	padding: calc(3 * var(--global--spacing-vertical)) 0;
 }