Change button and hover text color homepage

@lindavnr : Can you please let me know the desired color or color code so that I can provide you the required additional css.

Regards,
Tikaram

@lindavnr :  Login to your WordPress admin section. Go to Appearance => Customize => Additional css and add the following css.

.header-media .more-link .readmore {
  background-image: unset;
  background-color: #95c221;
}

a:hover {
  color: #95c221;
}

Let me know if this helps you out.

Regards,
Tikaram

@lindavnr : Please try adding the following additional css.

.header-media .more-link .readmore:hover {
  background-image: unset;
  background-color: #95c221;
}

@media screen and (min-width: 48em) {
  #fullscreen-menu-toggle:hover,
  #fullscreen-menu-toggle:focus,
  .absolute-header #fullscreen-menu-toggle:hover,
  .absolute-header #fullscreen-menu-toggle:focus,
  .absolute-header .scroll-down:hover {
    color: #95c221;
  }
}

.menu-inside-wrapper .main-navigation .nav-menu .current_page_item>a:after,
.wpcf7-form-control~.focus-border,
.comment-form>p>input~.focus-border,
.comment-form>p>textarea~.focus-border,
.post-wrapper .more-link .readmore:hover::after,
.scroll-down:before,
.scroll-down:after,
.scroll-down>span:before,
.scroll-down>span:after,
.fullscreen-menu-toggle:before,
.fullscreen-menu-toggle:after,
.fullscreen-menu-toggle>span:before,
.fullscreen-menu-toggle>span:after,
.home .post-wrapper .more-link .readmore:hover::after,
.home .post-wrapper .more-link .readmore:focus::after,
.recent-blog-content .archive-post-wrap .hentry .more-link .readmore:hover::after,
.recent-blog-content .archive-post-wrap .hentry .more-link .readmore:focus::after {
  background-color: #95c221;
}

Regards,
Tikaram