fix reactionlist css

Author: Tom Hutman

src/styles/MessageList.scss

@@ -4,8 +4,6 @@
   overflow-y: auto;
   -webkit-overflow-scrolling: touch; /* enable smooth scrolling on ios */
   padding: 0 0 0 0;
-  position: relative;
-  z-index: 0;
 
   .str-chat__reverse-infinite-scroll {
     padding-top: 75px;

src/styles/ReactionList.scss

@@ -31,7 +31,7 @@
     position: absolute;
     right: 15px;
     top: -28px;
-    z-index: 99;
+    z-index: 1;
 
     @extend %background-reaction-list;