.product_img {
    width: 100%;
    height: 240px;
    position: relative;
    display: inline-block;
    overflow: hidden;
    background: #f0f0f0;
    padding: 20px;
    border-radius: 5px;
}

    .product_img .caption {
        width: 0;
        height: 0;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        display: block;
        background: #197ecb;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease-in-out;
    }

    .product_img:hover .caption {
        opacity: 1;
        visibility: visible;
        width: 80%;
        height: 80%;
    }

    .product_img.two .caption {
        transform: none;
        opacity: 0;
        visibility: hidden;
        left: 0;
        top: inherit;
        bottom: -50px;
        width: 100%;
        height: 50px;
    }

    .product_img.two:hover .caption {
        bottom: 0;
        opacity: 1;
        visibility: visible;
    }