Fix CSS padding of `.content pre code` (#8620)

fix https://github.com/FreshRSS/FreshRSS/discussions/8618
And also duplicated `.box .box-content .item.feed`

p/themes/base-theme/frss.css

@@ -1082,16 +1082,13 @@ input[type="checkbox"]:focus-visible {
 }
 
 .box .box-content .feed.item {
+	padding: var(--frss-padding-top-bottom) 0 calc(var(--frss-padding-top-bottom) / 2) 2rem;
+	display: block;
 	font-size: 0.9rem;
 	line-height: 1.5;
 	text-indent: -3rem;
 }
 
-.box .box-content .item.feed {
-	padding: var(--frss-padding-top-bottom) 0 calc(var(--frss-padding-top-bottom) / 2) 2rem;
-	display: block;
-}
-
 .box .box-content .item.feed.emptyCategory {
 	padding: 0.5rem 1rem 0.5rem 0;
 }
@@ -1807,6 +1804,11 @@ a.website:hover .favicon {
 	border: 1px solid var(--frss-border-color);
 }
 
+.content pre code {
+	padding: 0;
+	border: none;
+}
+
 .subtitle > div {
 	display: inline;
 }

p/themes/base-theme/frss.rtl.css

@@ -1082,16 +1082,13 @@ input[type="checkbox"]:focus-visible {
 }
 
 .box .box-content .feed.item {
+	padding: var(--frss-padding-top-bottom) 2rem calc(var(--frss-padding-top-bottom) / 2) 0;
+	display: block;
 	font-size: 0.9rem;
 	line-height: 1.5;
 	text-indent: -3rem;
 }
 
-.box .box-content .item.feed {
-	padding: var(--frss-padding-top-bottom) 2rem calc(var(--frss-padding-top-bottom) / 2) 0;
-	display: block;
-}
-
 .box .box-content .item.feed.emptyCategory {
 	padding: 0.5rem 0 0.5rem 1rem;
 }
@@ -1807,6 +1804,11 @@ a.website:hover .favicon {
 	border: 1px solid var(--frss-border-color);
 }
 
+.content pre code {
+	padding: 0;
+	border: none;
+}
+
 .subtitle > div {
 	display: inline;
 }