Make the primary text colour easier to read #22
                
     Merged
            
            
          
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Currently the primary text is coloured in relatively light gray. This PR changes it to be substantially darker and, hopefully, easier to read.
The following picture presents three text colour variants:
#727272(current),rgba(0, 0, 0, 0.87)and#000000. This PR proposes#111111, which is somewhere between the latter ones.