CSS - Web responsive con problemas en IOS (apple)

body {

    font-family: 'Open Sans' , sans-serif;

      background-image: url(../img/nailslove.jpg);

    background-size: 100vw 100vh;

    background-attachment: fixed;

    margin: 0;

    color: black;

    text-align: center;

}

background-repeat: no-repeat;