Mobile Buttons Side by Side

Site URL: https://michalash.com/home

Hi there, I am working on this website for a client and I cannot figure out how to ensure my buttons stay side by side on the mobile version. They always end up stacked like this. Any custom CSS solutions out there? Thanks in advance, appreciate all the help!

Add to Design > Custom CSS

/* Mobile buttons side by side */
@media screen and (max-width:767px) {
div#block-yui_3_17_2_1_1628880162664_6290+.row .span-4 {
    width: 50% !important;
    float: left !important;
}
}