html {
    height: 100%;
}
body {
    background: linear-gradient(rgba(232,245,233,0.4), rgba(232,245,233,0.4)), url(background.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    margin: 0;
    font-family: Verdana, sans-serif;
}