Changing text color of a button on other pages?

The easiest way to do this would make the button text orange by default, then on the Homepage under this under Settings -> Advanced -> Page Header Code Injection

<style type="text/css">
.header-display .btn {
  color:white;
}
</style>

I am using this custom css code

//NAVIGATION BUTTON COLOR CHANGE

.Header-nav-item[href="/lets-eat"]{
    background: transparent !important;
    border: 2px solid #B98847 !important;
  color: #00000 !important;}

.Header-nav-item[href="/lets-eat"]:hover {
  color: #9D9995 !important;
}