diff --git a/src/Facepile.jsx b/src/Facepile.jsx
index 77d158fb..b305c6d3 100644
--- a/src/Facepile.jsx
+++ b/src/Facepile.jsx
@@ -12,6 +12,7 @@ export function Facepile({ participants }) {
     >
       {participants.map((member) => (
         <div
+          key={member.userId}
           className={styles.avatar}
           style={{ backgroundColor: colorHash.hex(member.name) }}
         >
diff --git a/src/Facepile.module.css b/src/Facepile.module.css
index 94b29a4c..02c5f6ed 100644
--- a/src/Facepile.module.css
+++ b/src/Facepile.module.css
@@ -1,4 +1,5 @@
 .facepile {
+  display: flex;
   margin: 0 16px;
 }