.y-icon_24x24 {
  display: inline-block;
  width: 24px;
  height: 24px;
  background-image: url("/image/social_icon_24x24.png");
  background-repeat: no-repeat;
  background-size: auto;
}
.weixin-icon_24x24   { background-position: 0px   0px; }
.weibo-icon_24x24    { background-position: 0px -24px; }
.qq-icon_24x24       { background-position: 0px -48px; }
.facebook-icon_24x24 { background-position: 0px -72px; }