diff --git a/sphinx/themes/basic/static/basic.css_t b/sphinx/themes/basic/static/basic.css_t
index 0a0447f0ff4..d8f3fe74626 100644
--- a/sphinx/themes/basic/static/basic.css_t
+++ b/sphinx/themes/basic/static/basic.css_t
@@ -339,8 +339,9 @@ p.sidebar-title {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.admonition, div.topic, aside.topic, blockquote {
+div.admonition, div.topic, blockquote {
     clear: left;
 }
 
@@ -348,8 +349,9 @@ div.admonition, div.topic, aside.topic, blockquote {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     border: 1px solid #ccc;
     padding: 7px;
     margin: 10px 0 10px 0;
@@ -389,9 +391,9 @@ div.sidebar > :last-child,
 aside.sidebar > :last-child,
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents > :last-child,
+aside.topic > :last-child,
 {% endif %}
 div.topic > :last-child,
-aside.topic > :last-child,
 div.admonition > :last-child {
     margin-bottom: 0;
 }
@@ -400,9 +402,9 @@ div.sidebar::after,
 aside.sidebar::after,
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents::after,
+aside.topic::after,
 {% endif %}
 div.topic::after,
-aside.topic::after,
 div.admonition::after,
 blockquote::after {
     display: block;
diff --git a/sphinx/themes/bizstyle/static/bizstyle.css_t b/sphinx/themes/bizstyle/static/bizstyle.css_t
index 47dcc7e4fb0..a524345f9a9 100644
--- a/sphinx/themes/bizstyle/static/bizstyle.css_t
+++ b/sphinx/themes/bizstyle/static/bizstyle.css_t
@@ -308,8 +308,9 @@ div.quotebar {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     background-color: #f8f8f8;
 }
 
diff --git a/sphinx/themes/classic/static/classic.css_t b/sphinx/themes/classic/static/classic.css_t
index 9107dc9344d..789bec81128 100644
--- a/sphinx/themes/classic/static/classic.css_t
+++ b/sphinx/themes/classic/static/classic.css_t
@@ -292,8 +292,9 @@ div.seealso {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     background-color: #eee;
 }
 
diff --git a/sphinx/themes/epub/static/epub.css_t b/sphinx/themes/epub/static/epub.css_t
index 9cc47152bdc..a30344431a0 100644
--- a/sphinx/themes/epub/static/epub.css_t
+++ b/sphinx/themes/epub/static/epub.css_t
@@ -247,8 +247,9 @@ p.sidebar-title {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     border: 1px solid #ccc;
     padding: 7px 7px 0 7px;
     margin: 10px 0 10px 0;
diff --git a/sphinx/themes/nature/static/nature.css_t b/sphinx/themes/nature/static/nature.css_t
index c1a2cd6cb71..93f9a594483 100644
--- a/sphinx/themes/nature/static/nature.css_t
+++ b/sphinx/themes/nature/static/nature.css_t
@@ -196,8 +196,9 @@ div.seealso {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     background-color: #eee;
 }
 
diff --git a/sphinx/themes/nonav/static/nonav.css_t b/sphinx/themes/nonav/static/nonav.css_t
index d62536ab230..933365e073c 100644
--- a/sphinx/themes/nonav/static/nonav.css_t
+++ b/sphinx/themes/nonav/static/nonav.css_t
@@ -236,8 +236,9 @@ p.sidebar-title {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     border: 1px solid #ccc;
     padding: 7px 7px 0 7px;
     margin: 10px 0 10px 0;
diff --git a/sphinx/themes/pyramid/static/epub.css_t b/sphinx/themes/pyramid/static/epub.css_t
index 7f59c670c84..98741d0b8ab 100644
--- a/sphinx/themes/pyramid/static/epub.css_t
+++ b/sphinx/themes/pyramid/static/epub.css_t
@@ -256,8 +256,9 @@ div.seealso {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     background-color: #eee;
 }
 
diff --git a/sphinx/themes/pyramid/static/pyramid.css_t b/sphinx/themes/pyramid/static/pyramid.css_t
index bf18b8b156a..0ced6b29f8e 100644
--- a/sphinx/themes/pyramid/static/pyramid.css_t
+++ b/sphinx/themes/pyramid/static/pyramid.css_t
@@ -247,8 +247,9 @@ div.seealso {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     background: #eeeeee;
     border: 2px solid #C6C9CB;
     padding: 10px 20px;
diff --git a/sphinx/themes/sphinxdoc/static/sphinxdoc.css_t b/sphinx/themes/sphinxdoc/static/sphinxdoc.css_t
index f6a83840425..1817c48bcf5 100644
--- a/sphinx/themes/sphinxdoc/static/sphinxdoc.css_t
+++ b/sphinx/themes/sphinxdoc/static/sphinxdoc.css_t
@@ -268,8 +268,9 @@ div.quotebar {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     background-color: #f8f8f8;
 }
 
diff --git a/sphinx/themes/traditional/static/traditional.css_t b/sphinx/themes/traditional/static/traditional.css_t
index 5caf48ccf6c..8a2f0712fbe 100644
--- a/sphinx/themes/traditional/static/traditional.css_t
+++ b/sphinx/themes/traditional/static/traditional.css_t
@@ -508,8 +508,9 @@ p.rubric {
 
 {%- if docutils_version_info[:2] >= (0, 18) %}
 nav.contents,
+aside.topic,
 {% endif %}
-div.topic, aside.topic {
+div.topic {
     background-color: #eee;
     border: 1px solid #ccc;
     padding: 0 7px 0 7px;