body .koowa_header [class^="k-icon-document-"]:before,
body .koowa_header [class*=" k-icon-document-"]:before {
  content: "   ";
}

.k-icon-document-archive:before {
  background-image: url("../image/stp.png") !important;
}

[class^="k-icon-document-"]:before {
    background-size: contain;
    background-repeat: no-repeat;
    font-size: 22px;
}