diff --git a/source/css/_layout/sidebar.styl b/source/css/_layout/sidebar.styl
index 6c44324..ac9ddfc 100644
--- a/source/css/_layout/sidebar.styl
+++ b/source/css/_layout/sidebar.styl
@@ -10,6 +10,8 @@
     overflow: hidden
     >.content
       max-height: "calc(100vh - %s)" % ($gap * 5 + $navbar-height)
+      @media screen and (max-width: $device-tablet)
+        max-height: none
       overflow: auto
       scrollbar()
       text-align: justify
diff --git a/source/css/_layout/toc.styl b/source/css/_layout/toc.styl
index cd23558..a092f57 100644
--- a/source/css/_layout/toc.styl
+++ b/source/css/_layout/toc.styl
@@ -12,6 +12,7 @@
     top: 0
     padding-bottom: $gap * 0.25
   .content
+    max-height: "calc(100vh - %s)" % ($gap * 5 + $navbar-height)
     a
       border-left: $border-line solid transparent
       &:hover