OffCanvas menu - unable to change backround or menu text color

Hello,

Thanks for reaching out to us. To add css you can follow this guide: https://www.joomshaper.com/documentation/helix-framework/custom-code-css-js-meta

Please, use this css:

.offcanvas-menu {
    background-color: #fff !important;
}
.offcanvas-menu .offcanvas-inner a {
    color: #000000;
}
a.close-offcanvas .burger-icon>span {
    background-color: #000000 !important;
}

Thanks