.pic_frame {
    width:900px;
}

.container {
    position: relative;
    width: 50%;
    max-width: 280px;
    float: left;
    margin:25px 0px 0px 15px;
}

.image {
    display: block;
    width: 100%;
    height: 210px;
    border-radius: 5px;
}

.overlay {
    box-sizing: border-box;
    border-radius: 5px;
    position: absolute;
    bottom: 0px;
    background: rgb(0, 0, 0);
    background: rgba(0, 0, 0, 0.5); /* Black see-through */
    color: #f1f1f1;
    width: 100%;
    transition: .5s ease;
    opacity:0;
    color: white;
    font-size: 16px;
    padding: 20px;
    text-align: center;
}

.container:hover .overlay {
    opacity: 1;
}