css - intel xdk set button width -

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this should such easy thing. i'm writing first intel xdk app. have "login" button defaults 100% (nearly) of screen. want make narrower. i've added class width @ 50% , i've tried kinds of stuff can't figure out how make stupid button narrower, or matter, higher, thing want do.

enter image description here

i understand working on adding width , other options app designer cases this, unfortunately it's not out yet. in meantime, can try construct specific css rule might higher priority whatever rule setting it's width. might set both width , max-width. adding !important if necessary, though no 1 likes use if can avoid it.


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