Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

/*sticky background*/

body .whb-sticked .whb-general-header {
    background-color: green;
}
/*sticky main menu color*/
body .whb-sticked .woodmart-navigation .item-level-0.current-menu-item>a{
color:yellow;
}
body  .whb-sticked  .woodmart-navigation .item-level-0>a{
color:yellow;
}
body  .whb-sticked  .woodmart-navigation .item-level-0>a{
color:orange;
}
body  .whb-sticked  .woodmart-navigation .item-level-0>a:hover{
color:yellow;
}
body  .whb-sticked  .woodmart-navigation .item-level-0.menu-item-has-children>a:after{
color:orange;
} 
body  .whb-sticked  .woodmart-navigation .item-level-0.menu-item-has-children:hover >a:after{
color:yellow;
} 
body  .whb-sticked  .woodmart-navigation .item-level-0>a .nav-link-text:after {
    background-color: yellow;
}

/*My Account*/
body  .whb-sticked  .woodmart-header-links .item-level-0>a {
    color: orange;
}
body  .whb-sticked  .woodmart-header-links .item-level-0>a:hover {
    color: yellow;
}
/*Search*/
body  .whb-sticked  .search-button >a {
    color: orange;
}

body  .whb-sticked .search-button:hover>a {
    color: yellow;
}
/*wishlist*/
body  .whb-sticked  .woodmart-wishlist-info-widget .wishlist-icon {
color:orange;
}
body  .whb-sticked .woodmart-wishlist-info-widget .wishlist-count{
    color: red;
        background-color: yellow;
}
/*cart*/
body  .whb-sticked  .woodmart-shopping-cart .woodmart-cart-icon {
color:orange;
}
body  .whb-sticked  .woodmart-cart-design-5 .woodmart-cart-number{
    color: red;
        background-color: yellow;
}
body  .whb-sticked  .woodmart-shopping-cart .woodmart-cart-subtotal .amount {
    color: red;
}
/*compare*/
body  .whb-sticked  .woodmart-compare-info-widget .compare-icon {
color:orange;
}
body  .whb-sticked  .woodmart-compare-info-widget .compare-count{
color:yellow;
background-color:orange
}
body   .whb-sticked  .woodmart-cart-design-2 .woodmart-cart-number{
        color:yellow;
background-color:orange
}

Replace the colors as per your need

Best Regards