MartinJD Add this custom style from Appearance -> Edit Custom CSS
.SubscriptionMenu-button--follow {
color: black !important; // text color
background-color: red !important;
// on hover - preferably darker background
&:hover {
background-color: darken(red, 15%) !important; // adjust the percentage
}
// when clicked - preferably darkest background
&:active {
background-color: darken(red, 30%) !important; // adjust the percentage
}
}