message: fix z-index & dropdown scroll position
diff: @@ -105,7 +105,11 @@ class TopBarComponent extends Component<Props, State> {
  <StyledLink key={0} to="/" onClick={this.hideMobileMenu}>
  {t("topbar.home")}
  </StyledLink>,
  - <AntdDropdown key={1} overlay={this.renderBlockchainMenu()}>
  + <AntdDropdown
  + key={1}
  + overlay={this.renderBlockchainMenu()}
  + getPopupContainer={trigger => trigger.parentElement || document.body}
  + >
  <StyledLink className="ant-dropdown-link" to="#">
  {t("topbar.blockchain")} <Icon type="down" />
  </StyledLink>
  @@ -305,7 +309,7 @@ const Dropdown = styled("div", {
  ...contentPadding,
  position: "fixed",
  top: TOP_BAR_HEIGHT,
  - "z-index": "1",
  + "z-index": "10",
  width: "100vw",
  height: "100vh",
  alignItems: "flex-end!important",
  