.back {  background-image: url(../img-back/back-sen.gif); background-repeat: repeat-y}
.back-m1 {  background-image: url(../img-sozai/back-sozai3.gif); background-repeat: no-repeat; background-position: center}
.back-m2 { background-image: url(../img-sozai/back-sozai2.gif); background-repeat: no-repeat ; background-position: bottom}
.waku {  background-image: url(../img-waku/waku_3.gif); background-repeat: repeat-y}