#social {
  position: absolute;
  left: 0;
  top: 140px;
  width: 60px;
  height: 320px;
  z-index: 999;
}
#social .social_item {
  display: inline-block;
}
#social .social_item:hover {
  background-repeat: no-repeat;
  background-position: 0 top;
}
#social .social_item a {
  width: 40px;
  height: 40px;
  display: block;
  text-decoration: none;
  background-color: #ddd;
  color: #000;
  font-size: 16px;
  text-align: center;
  margin: 2px 0;
  line-height: 40px;
  transition: 0.3s;
}
#social .social_item a:hover {
  background-repeat: no-repeat;
  background-position: 0 top;
  color: #64C2FF;
}