diff --git a/src/ui/web/css/left-panel.css b/src/ui/web/css/left-panel.css
index 5a7ae221..3b49ff51 100644
--- a/src/ui/web/css/left-panel.css
+++ b/src/ui/web/css/left-panel.css
@@ -25,6 +25,7 @@ limitations under the License.
 
 .LeftPanel .utilities .FilterField {
     flex: 1;
+    min-width: 0;
 }
 
 .LeftPanel ul {
diff --git a/src/ui/web/css/room.css b/src/ui/web/css/room.css
index 07999a2a..4ed19c35 100644
--- a/src/ui/web/css/room.css
+++ b/src/ui/web/css/room.css
@@ -71,6 +71,7 @@ limitations under the License.
 .MessageComposer > input {
     display: block;
     flex: 1;
+    min-width: 0;
     box-sizing: border-box;
 }