.fullscreen_overlay {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.75);
    overflow-x: hidden;
    transition: 1s;
    text-align: center;
    vertical-align: middle;
}

#overlay-img {
    margin-top: 35px;
    margin-bottom: 25px;
    height: 550px;
    width: 450px;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}

.photo-gallery {
    margin-top: 25px;
    text-align: center;
}

.img-wrapper {
    margin: 0px 20px 20px 20px;
    height: auto;
    width: auto;
    display: inline-block;
    float: none;
}

.img-wrapper img:hover {
    height: 350px;
    width: 250px;
    transition: 0.5s;
}

.img-wrapper img {
    height: 300px;
    width: 200px;
}