$btn-hover-background-color: rgba(196, 196, 196, 0.4) !default;
$btn-active-background-color: rgba(168, 168, 168, 0.5) !default;
$windows-close-btn-hover-color: #E81123 !default;
$windows-close-btn-active-color: rgba(232, 17, 35, 0.6) !default;