[slides][biomin] Fix enumeration.

slides/biomin.md

@@ -307,15 +307,17 @@ PermeabilityType evaluatePermeability(PermeabilityType refPerm,
 
 ## Exercise tasks
 
+<div style="text-align: left; margin-left: 200px">
 <small>
-1. Get familiar with the code
-2. Implement the simplified chemical reactions
-3. Use source()-function to link chemistry-file to problem
-4. Vary parameters, so that leakage pathway is "sealed" (porosity $<0.07$)
-5. Implement new boundary condition for $\mathrm{CO_2}$-injection in lower aquifer
-6. Exchange the permeability law from Kozeny-Carman to a Power Law
+1. Get familiar with the code  
+2. Implement the simplified chemical reactions  
+3. Use source()-function to link chemistry-file to problem  
+4. Vary parameters, so that leakage pathway is "sealed" (porosity $<$ 0.07)  
+5. Implement new boundary condition for $\mathrm{CO_2}$-injection in lower aquifer  
+6. Exchange the permeability law from Kozeny-Carman to a Power Law  
 7. Use tabulated values for $\mathrm{CO_2}$
 </small>
+</div>
 
 ## Exercise