.photo-container {
  position: relative;
}

.photo-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.48); /* change the value to adjust the color and opacity */
}

.photo-container img {
  display: block;
  width: 100%;
  height: auto;
}