diff --git a/_layouts/categories.html b/_layouts/categories.html
index 0ac84ca..cef95dc 100644
--- a/_layouts/categories.html
+++ b/_layouts/categories.html
@@ -2,7 +2,7 @@
 layout: default
 ---
 
-<div class="reading-optimised">
+<div {% if page.hidesidebar %}{% else %}class="reading-optimised"{% endif %}>
     {{ content }}
     <ul class="post-list list-unstyled">
         {% assign categories = page.categories | split:',' %}
diff --git a/_layouts/category.html b/_layouts/category.html
index 746a0b8..62040ef 100644
--- a/_layouts/category.html
+++ b/_layouts/category.html
@@ -2,7 +2,7 @@
 layout: default
 ---
 
-<div class="reading-optimised">
+<div {% if page.hidesidebar %}{% else %}class="reading-optimised"{% endif %}>
     {{ content }}
     <ul class="post-list list-unstyled">
         {% for post in site.categories[page.category] %}
diff --git a/_layouts/page.html b/_layouts/page.html
index 38965a4..70ab8e8 100644
--- a/_layouts/page.html
+++ b/_layouts/page.html
@@ -2,7 +2,7 @@
 layout: default
 ---
 
-<article class="post reading-optimised">
+<article class="post{% if page.hidesidebar %}{% else %} reading-optimised{% endif %}">
 
   <header class="post-header">
     <h1 class="post-title">{{ page.title }}</h1>