.gallery a {
    margin: 5px;
    display: inline-block;
    width: 200px;
}
.gallery img {
    width: 100%;
    height: auto;
    cursor: pointer;
    border: 2px solid #305222;
    border-radius: 5px;
    transition: border-color 0.3s;
}
.gallery img:hover {
    border-color: #6aa84f;
}