Fix margin bottom on some pages (#13844)

Author: willdurand

src/amo/pages/Addon/styles.scss

@@ -4,10 +4,6 @@
   @include page-padding;
 }
 
-.Addon .Card {
-  margin-bottom: $padding-page;
-}
-
 .Addon-icon-wrapper {
   height: 40px;
   overflow: hidden;
@@ -231,3 +227,9 @@
 .ContributeCard {
   margin: 32px auto;
 }
+
+.AddonRecommendations {
+  // This is the last card in the page, and it doesn't need a `margin-bottom`,
+  // which `.CardList` adds by default.
+  margin-bottom: 0;
+}

src/amo/pages/LandingPage/styles.scss

@@ -2,6 +2,11 @@
 
 .LandingPage {
   @include page-padding;
+
+  & > .LandingAddonsCard:last-child {
+    // The last `.CardList` doesn't need a `margin-bottom`.
+    margin-bottom: 0;
+  }
 }
 
 .LandingPage-header {