Update 01-parallel-programming.md

Author: csccva

intro-day/docs/01-parallel-programming.md

@@ -234,7 +234,7 @@ Simple domains with different computational cost
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 ![](img/lumi2.jpg){.center width=80%}
-EuroHPC JU LUMI (HPE Cray EX) <br>at CSC (2021–)
+<small> EuroHPC JU LUMI (HPE Cray EX) at CSC (2021–) </small>
 </center>
 </div>