Update 01-parallel-programming.md

Author: csccva

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

@@ -143,15 +143,15 @@ Simple domains with similar computational cost
 
 <br>
 <!-- Copyright CSC -->
-![](img/eparallel.svg){.center width=80%}
+![](img/eparallel.svg){.center width=85%}
 </div>
 
 <div class=column>
 Simple domains with different computational cost
 
 <br>
 <!-- Copyright CSC -->
-![](img/mandelbrot-domains.png){.center width=50%}
+![](img/mandelbrot-domains.png){.center width=55%}
 </div>