Choose Options Button

My issue is that when someone clicks on “choose options” button, the pop up window is so narrow, that they can’t see the size chart I included.
I was able to put in this custom css (#colorbox, #cboxOverlay{
display: none !important;
})
to make the “Choose Options” button not activate the popup window, but I’d like to make the button “invisible”. I was also able to find css that would remove the button completely, but when doing so, took away the options on the product page. So I need to do one of the following: 1) Make the popup window wider 2) Remove the “Choose Options” button but still keep the options on the product page 3) Fake out the button by making the font color and background color both white.
Can you please help? Thanks!