#customize-controls .pro_info .upgrade-to-pro{
  background: var(--first-theme-color);  /* fallback for old browsers */
  background: -webkit-linear-gradient(right, var(--first-theme-color) , var(--second-theme-color) );  /* Chrome 10-25, Safari 5.1-6 */
  background-image: linear-gradient(to right, var(--first-theme-color) , var(--second-theme-color) ); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}
