Hi nikkiserotics.com,
Thanks for reaching to us.
Please navigate to Theme Settings > Styles and colors > Pages background. You can change the background of Shop pages, Blog pages, Portflio pages.
In case you want to do it for specific post / page only, you can use Theme Presets, please refer to our documentation https://xtemos.com/docs-topic/theme-settings-presets/
In order to do make buttons transparent, add below Custom CSS code to Theme Settings > Custom CSS > Global custom CSS
.woocommerce-MyAccount-navigation ul li.is-active>a,
.woocommerce-MyAccount-navigation ul li a:hover {
background-color: transparent;
}
Regards,