wekan/client/components/settings/settingHeader.css

#header #header-main-bar .setting-header-btn {
  color: #f2f2f2;
  margin-left: 20px;
  padding-right: 10px;
  height: 28px;
  font-size: 13px;
  float: left;
  overflow: hidden;
  line-height: 28px;
  margin: 0 2px;
}
#header #header-main-bar .setting-header-btn.active,
#header #header-main-bar .setting-header-btn:hover:not(.is-disabled) {
  background: rgba(0,0,0,0.15);
}
#header #header-main-bar .setting-header-btn i.fa {
  float: left;
  display: block;
  line-height: 28px;
  color: #f2f2f2;
  margin: 0 10px;
}
#header #header-main-bar .setting-header-btn + span {
  display: inline-block;
  margin-top: 1px;
  margin-right: 10px;
}