Customizing a button in a header navigation

Hello! Any chance you could help with customizing "book free call button".  First screenshot is how it looks now on the website and this is how I would like it to look. 

https://www.femaleentrepreneur.me/

hi @tuanphan! any chance you could help add a line of code? 

I would like the whole button to be highlighted like in the photo when being active. can you please help? 

15 hours ago, Patricija said:

hi @tuanphan! any chance you could help add a line of code? 

I would like the whole button to be highlighted like in the photo when being active. can you please help? 

 

Add this code under

nav.Header-nav--primary>div>a:last-child:hover {
    background-color: #d5e8e8 !important;
    border-color: #d5e8e8 !important;
    color: black !important;
}