.test {
  background-color: red;
}

.frontend-modal {
  display: none;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  background-color: orange;
  height: 200px;
  width: 200px;
}

.backend-modal {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  background-color: aqua;
  height: 200px;
  width: 200px;
}