discourse/plugins/chat/assets/stylesheets/mobile/base-mobile.scss

:root {
  --channel-list-avatar-size: 38px;
  --chat-header-offset: 56px;
}

.chat-message-container:not(.-user-info-hidden) {
  .chat-message {
    padding-top: 0.75em;
  }
}

html.has-full-page-chat {
  body #main-outlet {
    padding: 0;

    .main-chat-outlet {
      .chat-channel {
        min-width: 0;
      }

      &.has-side-panel-expanded {
        grid-template-columns: 1fr;

        .c-routes-channel {
          display: none;
        }
      }
    }
  }
}

.full-page-chat {
  grid-template-columns: 100%;
  width: 100%;

  .btn:active,
  .btn:hover {
    .d-icon {
      color: var(--primary-medium);
    }
  }

  .chat-channel {
    border-radius: 0;
    padding: 0;
  }

  .chat-drawer {
    width: 100%;
  }
}

.sidebar-container .channels-list .chat-channel-divider {
  padding-left: 1em;
}

.sidebar-container .channels-list .chat-channel-row {
  padding: 0.5em;
}

.create-channel-modal {
  .modal-inner-container {
    width: 95%;
  }
}

.chat-message-separator {
  margin-left: 0;
}

.header-dropdown-toggle.chat-header-icon .icon,
.c-footer .c-footer__item {
  &.active .d-icon {
    color: var(--primary-medium);
  }
  .chat-channel-unread-indicator {
    border-color: var(--primary-very-low);
  }
}