.image_area {
    position: relative;
}

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

.preview {
    overflow: hidden;
    width: 150px;
    height: 150px;
    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;
}