Added scroll bars to modals

stylesheets/_session.scss

@@ -558,7 +558,9 @@ label {
   max-width: 70vw;
   background-color: $session-shade-4;
   border: 1px solid $session-shade-8;
-  padding-bottom: $session-margin-lg;
+  overflow: hidden;
+  display: flex;
+  flex-direction: column;
 
   &__header {
     display: flex;
@@ -609,6 +611,8 @@ label {
     font-family: $session-font-accent;
     line-height: $session-font-md;
     font-size: $session-font-sm;
+    overflow-y: auto;
+    overflow-x: hidden;
 
     .message {
       text-align: center;
@@ -1566,6 +1570,13 @@ input {
     text-align: center;
     padding: 20px;
   }
+
+  // Height at which scroll bar appears on the group member list
+  @media (max-height: 804px) {
+    &__container {
+      overflow-y: visible;
+    }
+  }
 }
 .create-group-name-input {
   .session-id-editable {