#on {
  visibility: visible;
}
#off {
  visibility: hidden;
}
#twitter_div {
  overflow: hidden;
}
/* right side style */
#twitter_right {
  z-index: 10004;
  border: 2px solid #6CC5FF;
  background-color: #6CC5FF;
  position: fixed;
  right: -250px;
}
#twitter_right_img {
  position: absolute;
  top: -2px;
  left: -35px;
  border: 0;
}
/* left side style */
#twitter_left {
  z-index: 10004;
  border: 2px solid #6CC5FF;
  background-color: #6CC5FF;
  position: fixed;
  left: -250px;
}
#twitter_left_img {
  position: absolute;
  top: -2px;
  right: -35px;
  border: 0;
}