:root {
  --def-time: .25s;
  --close-size: 3em;
}


.modal {
  position: absolute;
  top: 0px;
  left: 0px;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  
  pointer-events: none;
  opacity: 0;
  transition: var(--def-time) opacity ease-in;
}

.modal.is-active {
  opacity: 1;
  pointer-events: initial;
}

.modal .modal-background {
  position: absolute;
  background-color: rgba(0, 0, 0, 0.8);
  height: 100%;
  width: 100%;
}

.modal .modal-content {
  padding-bottom: 10em;
}

.modal .notification {
  padding: var(--gap);
}

.modal #alerta {
  margin-top: var(--close-size);
}

button.delete {
  position: absolute;
  top: var(--gap);
  right: var(--gap);
  height: var(--close-size);
  width: var(--close-size);
  line-height: var(--close-size);
  background-color: transparent;
  border: none;
}

button.delete:after {
  content: '✖';
  font-size: var(--close-size);
  filter: invert()
}

#exemplo1 {
  margin: 0 auto;
}

@media (min-width: 500px) {
  .modal .modal-content {
    width: 500px;
  }
}