fix background image in safari browser

body.safari:before {
    content: "";
    background-color: #352a1c;
    background-image: url(http://www.cottonwoodbuilt.com/wp-content/uploads/2016/03/BackgroundImageShort.jpg);
    background-position: center top;
    background-size: auto;
    background-repeat: no-repeat;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}