/* Ссылка "Поделиться" картинкой */
<style type="text/css">
.topic a.sharelink {
  display: inline-block; margin: 0 !important;
  color: transparent; z-index:1;
  height: 1em; width: 1em;
  background: url(https://forumstatic.ru/files/0017/52/b5/52295.png) center center no-repeat;
  background-size: 1em;
  padding-left: 2px; opacity: .25;
  position: relative;
  text-indent:-9999px;
}
.topic a.sharelink:hover {  opacity: 1;}
#pun-viewtopic .post h3 strong {margin-right: .5em;}
.punbb .topic a.sharelink:before {
  content: " ";
  display: inline-block;
  width: 0; height: 0;
  position: absolute;
  text-indent: 0 !important;
  bottom: -5px; right: 4px;
  border: solid 5px;
  border-color:transparent transparent rgba(0,0,0,.7) transparent;
  border-radius:2em 0 0 0;
}
.punbb .topic a.sharelink:after {
  content: "Поделиться";
  font-size: 90% !important;
  color: #fff;
  padding: 0 8px;
  line-height: 24px;
  background: rgba(0,0,0,.7);
  border-radius: 4px;
  position: absolute;
  bottom: -29px;
  right: -5px;
}
a.sharelink:before, a.sharelink:after {visibility: hidden;opacity: 0;transition: .4s ease;cursor: text;text-indent:0}
a.sharelink:hover:before, a.sharelink:hover:after {visibility: visible !important; opacity: 1.0;}
</style>