.banner-popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('URL_DE_TU_IMAGEN.jpg') no-repeat center center;
  background-size: cover;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;  /* aseguramos que esté por encima */
}

.banner-content {
  text-align: center;
}

.banner-button {
  display: inline-block;
  padding: 15px 30px;
  font-size: 18px;
  color: #ffffff;
  background-color: #e50043;  /* color corporativo Dromosport */
  text-decoration: none;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

.banner-button:hover {
  background-color: #c4003a;
}