Use the below CSS code to chage menu text color on your shared site.

#page-container .primary-desktop-light .sh-header:not(.sh-sticky-header-active) .sh-nav > li > a,
#page-container .primary-desktop-light .sh-header:not(.sh-sticky-header-active) .sh-nav > li.menu-item > a > i{
        color: rgba(40,40,40,0.69) !important;
}