body {
    background-image: url(/assets/trees.jpg);
    background-repeat: repeat-x;
    background-color: black;
}

.popup-image {
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(0,0,0,.9);
    height: 100%;
    width: 100%;
    z-index: 100;
    display: none;
}

.popup-image span {
    position: absolute;
    top: 0;
    right: 10px;
    font-size: 60px;
    font-weight: bolder;
    color: #fff;
    cursor: pointer;
    z-index: 100;
}

.popup-image img {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 5px solid #fff;
    border-radius: 5px;
    width: 750px;
    object-fit: cover;
}

@media (max-width:768px){
    .popup-image img{
        width:95%;
    }
}