.ban-2{
    background-image: url(../img/slide1.jpg);
    background-attachment: fixed;
    background-position: center center;
    background-size: cover;
    height: 250px;
}

.ban-3{
    background-image: url(../img/slide2.jpg);
    background-attachment: fixed;
    background-position: center center;
    background-size: cover;
    height: 250px;
}

.ban-4{
    background-image: url(../img/slide3.jpg);
    background-attachment: fixed;
    background-position: center center;
    background-size: cover;
    height: 250px;
}

.ban-5{
    background-image: url(../img/slide4.jpg);
    background-attachment: fixed;
    background-position: center center;
    background-size: cover;
    height: 250px;
}