metamask-extension/ui/components/app/modals/index.scss

@import 'account-details-modal/index';
@import 'account-modal-container/index';
@import 'cancel-transaction/index';
@import 'confirm-remove-account/index';
@import 'deposit-ether-modal/index';
@import 'edit-approval-permission/index';
@import 'export-private-key-modal/index';
@import 'hide-token-confirmation-modal/index';
@import 'metametrics-opt-in-modal/index';
@import 'new-account-modal/index';
@import 'qr-scanner/index';
@import 'transaction-confirmed/index';
@import 'customize-nonce/index';
@import 'convert-token-to-nft-modal/index';

.modal {
  z-index: 1050;
  position: fixed;
  width: 500px;
  transform: translate3d(-50%, -50%, 0);
  top: 50%;
  left: 50%;

  &__content {
    margin: 0;
    background-color: var(--color-background-default);
    animation-fill-mode: forwards;
  }

  &__backdrop {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1040;
    background-color: var(--color-overlay-alterantive);
    animation-fill-mode: forwards;
    animation-duration: 0.3s;
  }

  & > div:focus {
    outline: none !important;
  }
}