.modal {
  display: none; 
  position: fixed; 
  z-index: 9999; 
  padding-top: 60px; 
  left: 0; top: 0;
  width: 100%; height: 100%;
  overflow: auto; 
  background-color: rgba(0,0,0,0.8);
  justify-content: center;
  align-items: center;
}

.modal-content {
  display: block;
  margin: auto;
  max-width: 90%;
  max-height: 90%;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(0,0,0,0.5);
}

.modal-close {
  position: absolute;
  top: 20px; right: 35px;
  color: #fff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
}

.modal-close:hover {
  color: #bbb;
}