testing shake addition to send button on finished recording.

stylesheets/_session_constants.scss

@@ -175,6 +175,29 @@ $session-font-h4: 16px;
   }
 }
 
+@mixin subtle-shake() {
+    animation: shake 0.82s cubic-bezier(.36,.07,.19,.97) both;
+    transform: translate3d(0, 0, 0);
+  
+  @keyframes shake {
+    10%, 90% {
+      transform: translate3d(-1px, 0, 0);
+    }
+    
+    20%, 80% {
+      transform: translate3d(2px, 0, 0);
+    }
+  
+    30%, 50%, 70% {
+      transform: translate3d(-4px, 0, 0);
+    }
+  
+    40%, 60% {
+      transform: translate3d(4px, 0, 0);
+    }
+  }
+}
+
 $session-subtle-factor: 0.6;
 
 @function subtle($color) {

stylesheets/_session_conversation.scss

@@ -338,6 +338,10 @@
 
 .send-message-button {
   animation: fadein $session-transition-duration;
+
+  &---shake {
+    @include subtle-shake();
+  }
 }
 
 .session-recording {
@@ -363,7 +367,6 @@
 
     .session-icon-button {
       animation: fadein $session-transition-duration;
-      opacity: 1;
       border-radius: 50%;
       width: $actions-element-size;
       height: $actions-element-size;

ts/components/session/conversation/SessionRecording.tsx

@@ -200,8 +200,11 @@ class SessionRecordingInner extends React.Component<Props, State> {
           null
         }
 
-        {!isRecording && (
+        {!isRecording  && (
-          <div className="send-message-button">
+          <div className={classNames(
+            "send-message-button",
+            hasRecording && 'send-message-button---shake'
+            )}>
             <SessionIconButton
               iconType={SessionIconType.Send}
               iconSize={SessionIconSize.Large}