#perennials-drawing {
    text-align: center;
}
#perennials-drawing img {
    /* /images/grafs/2011/perennials.png */
    width: 600px;
    height: 441px;
}
@media only screen and (max-width: 600px) {
    #perennials-drawing img {
        width: 100%;
        height: auto;
    }
}
#perennial-border {
    text-align: center;
}
#perennial-border img {
    /* /images/grafs/2009/perennial-border.jpg */
    width: 650px;
    height: 433px;
}
@media only screen and (max-width: 700px) {
    #perennial-border img {
        width: 100%;
        height: auto;
    }
}