ManagementSystem/BACKEND/resources/scss/modal.scss

$overlay: rgba(0, 0, 0, 0.5);

.modal {
  background-color: $overlay;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: visibility 0s linear 0.5s, opacity 0.5s;
}