body {
    text-align: center;
    background-color: bisque;
}

nav {
    text-align: left;
    margin-bottom: 1em;
}

#big_image {
    margin-bottom: 1em;
}

#big_image img {
    width: auto;
    height: 350px;
    border: 4px double black

    
}

#thumbnails img {
    width: auto;
    height: 100px;
    margin: 5px;
    border: 4px double black;
    cursor: pointer;
}