UI: fix overlap composer

common/common.scss

@@ -1,4 +1,5 @@
 @import "buttons";
+@import "compose";
 @import "header";
 @import "hiddenstuff";
 @import "main";

scss/compose.scss

@@ -0,0 +1,3 @@
+#reply-control {
+  z-index: 999;
+}