odin-default-css-exercises/animation/03-pop-up/solution/solution.css

* {
  padding: 0;
  margin: 0;
}

.popup-container {
  width: 100vw;
  height: 100vh;
  background-color: #ffffff;
  opacity: 1;
  transition: background-color 0.5s ease-in, opacity 0.5s ease-in;
}

.popup-container.show {
  background-color: #000000;
  opacity: 40%;
}

#trigger-modal,
.popup-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.popup-modal {
  position: absolute;
  width: 30%;
  border: 1px solid black;
  background-color: white;
  display: flex;
  justify-content: space-between;
  visibility: hidden;
}

.popup-modal.show {
  visibility: visible;
}