.btn-secondary{background:#000;color:#fff;box-shadow:inset 0 0 #fff0;transition:box-shadow .2s ease}.btn-secondary:hover{box-shadow:inset 100vw 100vh #fff3}.btn-secondary:active{box-shadow:inset 100vw 100vh #ffffff26}.btn-secondary:disabled{background:#00000080;color:#ffffff80;box-shadow:none}