diff --git a/docs/assets/bootstrap.zip b/docs/assets/bootstrap.zip
index d0a3ffdf7d..6db7bd327b 100644
Binary files a/docs/assets/bootstrap.zip and b/docs/assets/bootstrap.zip differ
diff --git a/docs/assets/css/bootstrap.css b/docs/assets/css/bootstrap.css
index 144783be44..9f0420b5b1 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -393,7 +393,7 @@ dd {
 hr {
   margin: 18px 0;
   border: 0;
-  border-top: 1px solid #e5e5e5;
+  border-top: 1px solid #eeeeee;
   border-bottom: 1px solid #ffffff;
 }
 strong {
diff --git a/less/type.less b/less/type.less
index ae43d19405..6ba83bc3a3 100644
--- a/less/type.less
+++ b/less/type.less
@@ -138,7 +138,7 @@ dd {
 hr {
   margin: @baseLineHeight 0;
   border: 0;
-  border-top: 1px solid #e5e5e5;
+  border-top: 1px solid @hrBorder;
   border-bottom: 1px solid @white;
 }
 
diff --git a/less/variables.less b/less/variables.less
index 9f58d730ee..ced64d7cd6 100644
--- a/less/variables.less
+++ b/less/variables.less
@@ -61,6 +61,9 @@
 // Input placeholder text color
 @placeholderText:         @grayLight;
 
+// Hr border color
+@hrBorder:                @grayLighter;
+
 // Navbar
 @navbarHeight:                    40px;
 @navbarBackground:                @grayDarker;