a.btn_site_em {
  display: inline-block;
  background: transparent;
  color: #666666;
  border: 1px solid #666666;
  border-radius: 2px;
  min-width: 2.4em;
  font-size: 80%;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  padding: 10px;
  transition: all 0.2s;
  margin: 20px 5px 0 5px;
}
a.btn_site_em:visited {
  background: transparent;
  color: #666666;
  border: 1px solid #666666;
  text-decoration: none;
}
a.btn_site_em:active {
  background: #666666;
  color: #ffffff;
  border: 1px solid #666666;
  text-decoration: none;
}
a.btn_site_em:hover {
  background: #666666;
  color: #ffffff;
  border: 1px solid #666666;
  text-decoration: none;
  opacity: 1;
}