div.gallery{
text-align: center;
}
div.image {
    border: 1px solid #ccc;
}

div.image:hover {
    border: 1px solid #777;
    width: 300px !important;
}

div.image img {
    width: 300px;
    height: 250px;
}

* {
    box-sizing: border-box;
}

.responsiveimg {
    /* padding: 6px; */
    display:inline-flex;
    width: auto;
}

@media only screen and (max-width: 700px) {
    .responsive {
        width: 49.99999%;
        margin: 6px 0;
    }
}

@media only screen and (max-width: 500px) {
    .responsive {
        width: 100%;
    }
}