diff --git a/framework/core/less/forum/Slidable.less b/framework/core/less/forum/Slidable.less
index 132fba4cf..c19597afa 100644
--- a/framework/core/less/forum/Slidable.less
+++ b/framework/core/less/forum/Slidable.less
@@ -17,7 +17,7 @@
       top: 0;
       bottom: 0;
       left: 0;
-      width: auto;
+      width: 100%;
       height: auto;
       z-index: 0;
       color: #fff !important;
@@ -36,6 +36,9 @@
     .Slidable-underneath--left {
       text-align: left;
     }
+    .Slidable-underneath--right {
+      left: unset;
+    }
     .Slidable-content {
       .transition(~"box-shadow 0.2s, border-radius 0.2s");