.lsf-slack{width:1em;height:1em;background:url(../img/Slack_Mark_Web.png) center center no-repeat;background-size:cover}.wpg-button .lsf.lsf-slack{display:inline-block;font-size:16px;margin-top:5px}#wpg-login.large .wpg-button .lsf.lsf-slack{font-size:30px;margin-top:-16px}