.overlay-container .overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.4rem;
  background-color: rgba(255, 255, 255, 0.7);
  text-align: center;
  font: 0/0 a; /* Remove the gap between inline(-block) elements */
}

.overlay-container .overlay:before {
  content: ' ';
  display: inline-block;
  vertical-align: middle;
  height: 100%;
}

.overlay-container .overlay span {
  font: 16px/1 Arial, sans-serif; /* Reset the font property */
  display: inline-block;
  vertical-align: middle;
}