correct css format

docs/_static/css/my_theme.css

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+.small {
+    font-size:60%;
+}

docs/release_notes.rst

@@ -1,101 +1,103 @@
-Version 0.5.1 `February 10, 2022`
-----------------------------------
+.. role:: small
+
+Version 0.5.1 :small:`February 10, 2022`
+------------------------------------------
 
 - Make PegasusIO work with Zarr v2.11.0.
 - Bug fix in quality control. [PR `#89 <https://github.com/klarman-cell-observatory/pegasusio/pull/89>`_ by `hoondy <https://github.com/hoondy>`_]
 
-Version 0.5.0 `January 24, 2022`
-----------------------------------
+Version 0.5.0 :small:`January 24, 2022`
+-----------------------------------------
 
 - Add support on 10x Visium spatial data
 
   - Read the data folder by ``read_input`` function with ``file_type="visium"`` option.
 
   - Write 10x Visium data to Zarr format by ``write_output`` function with output file name of ``.zarr.zip`` extension.
 
-Version 0.4.1 `November 4, 2021`
-----------------------------------
+Version 0.4.1 :small:`November 4, 2021`
+----------------------------------------
 
 - Fix issues on ``UnimodalData`` object construction.
 
-Version 0.4.0 `October 19, 2021`
----------------------------------
+Version 0.4.0 :small:`October 19, 2021`
+-----------------------------------------
 
 - Add ``obsp`` and ``varp`` fields to store graph representation in terms of square matrices.
 - Allow copy from View of ``AnnData``.
 - In ``MultimodalData``, add ``register_attr`` function to register an attribute of a specified type in ``obs`` or ``obsm`` fields. This can be useful for adding information like gene signatures, etc.
 
-Version 0.3.1 `July 16, 2021`
--------------------------------
+Version 0.3.1 :small:`July 16, 2021`
+--------------------------------------
 
 - For ``aggregate_matrices`` function, allow sample-specific filtration on minimum number of UMIs (``nUMI`` column in sample sheet) and minimum number of genes (``nGene`` column in sample sheet), which would overwrite the corresponding parameters of the function for these samples.
 
-Version 0.3.0 `July 6, 2021`
--------------------------------
+Version 0.3.0 :small:`July 6, 2021`
+-------------------------------------
 
 - Add support for composite list (e.g. ``[0, pd.DataFrame, np.ndarray]``) in ``data.uns`` field for Zarr read/write.
 
-Version 0.2.14 `June 28, 2021`
--------------------------------
+Version 0.2.14 :small:`June 28, 2021`
+---------------------------------------
 
 - Add parameter ``uns_white_list`` in ``filter_data`` function to keep QC statistics if needed.
 
-Version 0.2.13 `June 24, 2021`
--------------------------------
+Version 0.2.13 :small:`June 24, 2021`
+---------------------------------------
 
 - The ``aggregate_matrices`` function now accepts sample sheet in Python dictionary format besides a CSV file path string. See details in its description in API panel.
 
-Version 0.2.12 `May 28, 2021`
--------------------------------
+Version 0.2.12 :small:`May 28, 2021`
+---------------------------------------
 
 - Bug fix.
 
-Version 0.2.11 `May 17, 2021`
--------------------------------
+Version 0.2.11 :small:`May 17, 2021`
+--------------------------------------
 
 - Bug fix.
 
-Version 0.2.10 `February 2, 2021`
-----------------------------------
+Version 0.2.10 :small:`February 2, 2021`
+-------------------------------------------
 
 - Feature enhancement.
 
-Version 0.2.9 `December 25, 2020`
------------------------------------
+Version 0.2.9 :small:`December 25, 2020`
+------------------------------------------
 
 - Fix a bug for caching percent mito rate.
 - Improve `write_mtx` function.
 
-Version 0.2.8 `December 7, 2020`
------------------------------------
+Version 0.2.8 :small:`December 7, 2020`
+-----------------------------------------
 
 - Add support on loading ``loom`` file with Seurat-style cell barcode and feature key names.
 - Bug fix: resolve an issue on count matrix dimension inconsistency with feature metadata on data aggregation, when last feature has ``0`` count across all cell barcodes. Thanks to `Mikhail Alperovich <misha.alperovich1@gmail.com>`_ for reporting this issue.
 - Other bug fix and performance improvements.
 
-Version 0.2.7 `October 13, 2020`
------------------------------------
+Version 0.2.7 :small:`October 13, 2020`
+-----------------------------------------
 
 - Add support for Nanostring GeoMx data format.
 - Fix bugs.
 
-Version 0.2.6 `September 28, 2020`
------------------------------------
+Version 0.2.6 :small:`September 28, 2020`
+-------------------------------------------
 
 Fix bug in SCP compatible output generation.
 
-Version 0.2.5 `August 19, 2020`
---------------------------------
+Version 0.2.5 :small:`August 19, 2020`
+----------------------------------------
 Adjustment for Pegasus command usage.
 
-Version 0.2.2 `June 16th, 2020`
---------------------------------
+Version 0.2.2 :small:`June 16th, 2020`
+----------------------------------------
 Fix bugs in data aggregation.
 
-Version 0.2.1 `June 8th, 2020`
---------------------------------
+Version 0.2.1 :small:`June 8th, 2020`
+---------------------------------------
 Fix bug in processing single ``h5`` file.
 
-Version 0.2.0 `June 7th, 2020`
---------------------------------
+Version 0.2.0 :small:`June 7th, 2020`
+---------------------------------------
 Initial release.