html,body{
    height: 100%;
    margin: 0;
}




body{
    background-image: url(../images/logo.jpg);
    background-size: 500px;
    background-position: center;
    background-repeat: repeat;
    background-attachment: fixed;
    display: flex;
    flex-direction: column;

}

main{
    flex: 1;
}