jupyterlab/packages/mainmenu-extension/style/index.css

/*-----------------------------------------------------------------------------
| Copyright (c) Jupyter Development Team.
| Distributed under the terms of the Modified BSD License.
|----------------------------------------------------------------------------*/

.jp-LabShell[data-shell-mode='single-document'] #jp-top-panel #jp-MainLogo {
  top: -28px;
}

@import url('~@jupyterlab/mainmenu/style/index.css');