diff --git a/res/css/views/right_panel/_ThreadPanel.scss b/res/css/views/right_panel/_ThreadPanel.scss
index 7b8d4d4746..ddc30fa8d9 100644
--- a/res/css/views/right_panel/_ThreadPanel.scss
+++ b/res/css/views/right_panel/_ThreadPanel.scss
@@ -316,6 +316,8 @@ limitations under the License.
     bottom: 0;
     left: 0;
     padding: 20px;
+    box-sizing: border-box; // Include padding and border
+    width: 100%;
 
     h2 {
         color: $primary-content;