Mobile menu button is invisible, please help

Hi, the mobile version of my site has a invisible button and I cant figure out which CSS code to change, please help me out

Figured out the solution, it worked by putting this into Theme->Customize->Additional CSS if anyone has this issue in the future:

#masthead .slicknav_menu a {
    color: white !important;

#masthead .slicknav_menu .slicknav_menutxt {
    color: black !important;