.shishiga {
    display: block;
    width: 400px;
    height: 270px;
    background-image: url(img/shishiga.jpg);
    background-position: left bottom;
    background-repeat: no-repeat;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}