Update README.md

README.md

@@ -7,4 +7,4 @@
     + [See Sec. 1.2/1.3/1.4/1.4.1/1.4.3](https://www.iag.usp.br/pos/sites/default/files/t_juan_c_b_pineda_corrigida.pdf)
     + [Advanced reference](https://ui.adsabs.harvard.edu/abs/2017MNRAS.466...63P/abstract)
 
-![imagen](./darkmatter.jpg)
+![imagen](./darkmatter.jpg){width = '50px'}