.r-border .tb, .r-border .bb {
  position: relative;
  height: 20px;
  overflow: hidden;
}
.r-border .cn {
  position: relative;
  width: 20px;
  height: 80px;
  background: url(../images/r-border.png);
  overflow: hidden;
}
.r-border .cn.r {
  position: absolute;
  margin-left: 100%;
  left: -20px;
  top: -20px;
}
.r-border .bb .cn {
  margin-top: -40px;
}

.r-border-small .tb, .r-border-small .bb {
  position: relative;
  height: 10px;
  overflow: hidden;
}
.r-border-small .cn {
  position: relative;
  width: 10px;
  height: 40px;
  background: url(../images/r-border-small.png);
  overflow: hidden;
}
.r-border-small .cn.r {
  position: absolute;
  margin-left: 100%;
  left: -10px;
  top: -10px;
}
.r-border-small .bb .cn {
  margin-top: -20px;
}