style.css

/* If the "Users" or "Messages" panes get too tall, make them scrollable */
.card {
  max-height: 100vh;
  overflow-y: auto;
}
.card .list-group {
  overflow-y: auto;
}

/* Add spacing between usernames and unread bubbles */
.badge {
  margin-left: 5px;
}

/* A class used to hide an element */
.hidden {
  display: none;
}