css - angular-strap modal transitions -


i'm trying use angular-strap handle modal opening/closing controller. backdrop animation css given on angular-strap docs keeps giving me errors - pretty sure i'm using wrong, can't seem find info on how use css. here's plunker of problem. seems it's ampersands causing problems. here code given on angular-strap docs:

.modal-backdrop.am-fade {     opacity: .5;     transition: opacity .5s linear;     &.ng-enter {         opacity: 0;         &.ng-enter-active {             opacity: .5;         }     }     &.ng-leave {         opacity: .5;         &.ng-leave-active {         opacity: 0;         }     } }

edit: further clarify, opening/closing modals doesn't cause me problems. css seem work until gets &.ng-enter.

changed css so:

.modal-backdrop.am-fade {     opacity: .7;     transition: opacity .35s linear; } .modal-backdrop.am-fade.ng-enter {     opacity: 0; } .modal-backdrop.am-fade.ng-enter.ng-enter-active {     opacity: .5; }  .modal-backdrop.am-fade.ng-leave {     opacity: .5; } .modal-backdrop.am-fade.ng-leave.ng-leave-active {     opacity: 0; }

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