Formatting image.

Author: adam-rumpf

README.md

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 A collection of small scripts demonstrating how to accomplish mathematical tasks in both [MATLAB](https://www.mathworks.com/products/matlab.html) (or [Octave](https://www.gnu.org/software/octave/index)) and in [Python](https://www.python.org/) using [SciPy](https://scipy.org/), [NumPy](https://numpy.org/), and [Matplotlib](https://matplotlib.org/).
 
-<img src="img/basics_cover.png" width="240px" title="Basic 3D plot demo." />
+<p align="center"><img src="img/basics_cover.png" width="300px" title="Basic 3D plot demo." /></p>
 
 ## Description