.base {  background-attachment: fixed; background-image: ; background-repeat: repeat; background-position: center center; clip:  rect(   )}
.placaa { background-attachment: fixed; background-image: url("images/watermarks/logica.jpg"); background-repeat: no-repeat; background-position: right bottom}
.placab { background-attachment: fixed; background-image: url("images/watermarks/logicb.jpg"); background-repeat: repeat-x; background-position: left top}
.mundito {  background-attachment: fixed; background-image: url("images/watermarks/soluciones.jpg"); background-repeat: no-repeat; background-position: center bottom}
.suscrip {  background-attachment: fixed; background-image: url("images/watermarks/ojo.jpg"); background-repeat: no-repeat; background-position: center center}