.main
{ 
background: #2755A9 url('../images/adventure_travels_bg.jpg') no-repeat;
}

.cien
{ 
background: #2755A9 url('../images/adventure_travels_cien.jpg') no-repeat;
}

.footer
{ 
background: #2755A9 url('../images/adventure_travels_footer.jpg') no-repeat;
}

.bg
{
background: #2755A9;
}