.source_icon:before {
  display: inline-block;
  visibility: visible;
  width: 16px;
  height: 16px;
  margin-left: -2pt;
  margin-top: -3pt;
  margin-bottom: -0.7ex;
  margin-right: 2pt;
  background-size: 16px;
  content: ' ';
}

.header_icon {
  width: 16px;
  height: 16px;
  margin-top: 2px;
}

.source_nagios:before     { background-image: url(../img/nagios.gif);     }
.source_prometheus:before { background-image: url(../img/prometheus.png); }
.source_pagerduty:before  { background-image: url(../img/pagerduty.png);  }
.source_jira:before       { background-image: url(../img/jira.png);       }
.source_nodeping:before   { background-image: url(../img/nodeping.png);   }

.instance_icon_epyk       { background-image: url(../img/epyk.png);       }
.instance_icon_grafana    { background-image: url(../img/grafana.svg);    }
.instance_icon_mother     { background-image: url(../img/mother.gif);     }
.instance_icon_runbook    { background-image: url(../img/kb.png);         }
.instance_icon_pagerduty  { background-image: url(../img/pagerduty.png);  }
.instance_icon_jira       { background-image: url(../img/jira.png);       }
.instance_icon_nodeping   { background-image: url(../img/nodeping.png);   }