.popup-overlay,
#gumroad-popup-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  justify-content: center;
  align-items: center;
  z-index: 9999;
  padding: 16px;
  box-sizing: border-box;
}

.popup-overlay .popup,
#gumroad-popup-overlay .popup {
  background: #fff;
  padding: 24px;
  border-radius: 8px;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.popup h2 {
  margin-top: 0;
  text-align: center;
}

.popup input[type="text"],
.popup input[type="email"] {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.popup button {
  display: block;
  margin: 16px auto 0;
  padding: 10px 20px;
  background: #1abc9c;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.popup button:hover {
  background: #129280;
}