css - Change color of geomicons -

i'm using geomicons , need change colors.

for example, <span class='geomicon-info-alt'/>, black circle black letter i in on white background.

i want change white letter i on black circle background this:

however, if color: white; background-color: black, i'll square black background below.

can 1 give me suggestion on how fix it? thanks,

updated tried border-radius: 50% suggested in comment below. it's better there's still little black in left edge.

applying css can output.

.geomicon-info-alt {      color:#ffffff;     background:black;     border-radius:50%;     border:0; }

note : if height , width same use border-radius:50% otherwise manually change border-radius value desired output..

Premier