remove iframe border

src/main/webapp/WEB-INF/view/admin/system/index.jsp

@@ -14,7 +14,7 @@
 		</jsp:include>
 
 		<div id="content" class="content-wrapper">
-			<iframe id="contentFrame" src="<%=request.getContextPath()%>/admin/server/_plugin/kopf/" width="100%" height="400" seamless></iframe>
+			<iframe id="contentFrame" src="<%=request.getContextPath()%>/admin/server/_plugin/kopf/" seamless></iframe>
 		</div>
 
 		<jsp:include page="/WEB-INF/view/common/admin/footer.jsp"></jsp:include>

src/main/webapp/css/admin/style.css

@@ -14,6 +14,11 @@
 	font-size: 13px;
 }
 
-button > i {
+button>i {
 	margin-right: 0.2em;
+}
+
+.content-wrapper iframe {
+	border: 0;
+	width: 100%;
 }