Add below css code in Appearance -> Editor -> style.css file
.woocommerce table.shop_table th, .woocommerce-page table.shop_table th { color:#6E6D6D }
.woocommerce #respond input#submit.alt, .woocommerce a.button.alt, .woocommerce button.button.alt, .woocommerce input.button.alt {
background-color: #5bd3a7 !important;
}
Regards
Grace Themes