.image_area {
  position: relative;
}

img {
    display: block;
    max-width: 100%;
}

.preview {
    overflow: hidden;
    width: 160px; 
    height: 160px;
    margin: 10px;
    border: 1px solid red;
}

.modal-lg{
    max-width: 1000px !important;
}

.overlay {
  position: absolute;
  bottom: 10px;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.5);
  overflow: hidden;
  height: 0;
  transition: .5s ease;
  width: 100%;
}

.image_area:hover .overlay {
  height: 50%;
  cursor: pointer;
}

.text {
  color: #333;
  font-size: 20px;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  text-align: center;
}