.row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding: 30px 0px;
}

/* four columns */
.column {
    display: center;
    max-width: 23%;
    padding: 4px;
}

.column img {
    vertical-align: middle;
    padding-top: 12px;
    width: 100%;
    cursor: pointer;
}

.column img:hover {
    opacity: 0.5;
}


/* two columns */
@media screen and (max-width: 980px) {
    .column {
        flex: 50%;
        max-width: 45%;
    }
}

/* one column */
@media screen and (max-width: 600px) {
    .column {
        flex: 100%;
        max-width: 100%;
    }
}

.modal {
    display: none;
    position: fixed;
    z-index: 1; /* stacking */
    padding-top: 40px; /* location */
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto; 
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
    float: left;
    width: 450px;
    height: auto;
    margin: 40px;
}

#caption {
    margin: auto;
    margin-top: 40px;
    display: block;
    width: 80%;
    text-align: left;
    height: auto;
}

.modal-content,
#caption {
    animation-name: zoom;
    animation-duration: 0.6s;
}

@keyframes zoom {
    from {
        transform: scale(0);
    }

    to {
        transform: scale(1);
    }
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
}

.close:hover,
.close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* responsive layout */
@media only screen and (max-width: 980px) {
    .modal-content {
        width: 45%;
    }
}

#modalTitle {
    font-weight: bold;
    margin: 0;
    color: rgb(107, 150, 129);
    font-size: 35;
    margin-bottom: 40px;

}

#modalSize,
#modalMedium {
    font-size: 18px;
    margin-top: 10px;
    color: rgb(186, 188, 187);
    font-size: 18;
}