fix css visual bug on mobile (#1513)
fix css visual bug on mobile (#1513)

.tablist .button "width" isn't good on mobile 
how it currently looks: http://prntscr.com/sdygem
how it should look: http://prntscr.com/sdygnr
Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client