.bg15
{
    background-image: url('../img/15.jpg');
}
.bg16
{
    background-image: url('../img/16.jpg');
}
.bg17
{
    background-image: url('../img/17.jpg');
}
.bg18
{
    background-image: url('../img/18.jpg');
}
.bg19
{
    background-image: url('../img/19.jpg');
}
.bg20
{
    background-image: url('../img/20.jpg');
}
.bg21
{
    background-image: url('../img/21.jpg');
}
.bg22
{
    background-image: url('../img/22.jpg');
}
.bg23
{
    background-image: url('../img/23.jpg');
}