Revert "chore: Remove unused inappbrowser.css file (apache#1038)"

This reverts commit eac7303.

www/inappbrowser.css

@@ -0,0 +1,114 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+.inAppBrowserWrap {
+    margin: 0;
+    padding: 0;
+    outline: 0;
+    font-size: 100%;
+    vertical-align: baseline;
+    background: 0 0;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    z-index: 9999999;
+    box-sizing: border-box;
+    border: 40px solid #bfbfbf;
+    border: 40px solid rgba(0, 0, 0, 0.25);
+}
+
+.inAppBrowserWrapFullscreen {
+    border: 0;
+}
+
+.inappbrowser-app-bar {
+    height: 70px;
+    background-color: #404040;
+    z-index: 9999999;
+}
+
+.inappbrowser-app-bar-inner {
+    padding-top: 10px;
+    height: 60px;
+    width: 155px;
+    margin: 0 auto;
+    background-color: #404040;
+    z-index: 9999999;
+}
+
+.app-bar-action {
+    width: auto;
+    height: 40px;
+    margin-left: 20px;
+    font-family: "Segoe UI Symbol";
+    float: left;
+    color: white;
+    font-size: 12px;
+    text-transform: lowercase;
+    text-align: center;
+    cursor: default;
+}
+
+.app-bar-action[disabled] {
+    color: gray;
+    /*disable click*/
+    pointer-events: none;
+}
+
+.app-bar-action::before {
+    font-size: 28px;
+    display: block;
+    height: 36px;
+}
+
+/* Back */
+.action-back { 
+    margin-left: 0px;
+}
+
+.action-back::before {
+    content: "\E0BA";
+}
+
+.action-back:not([disabled]):hover::before {
+    content: "\E0B3";
+}
+
+/* Forward */
+.action-forward::before {
+    content: "\E0AC";
+}
+
+.action-forward:not([disabled]):hover::before {
+    content: "\E0AF";
+}
+
+/* Close */
+.action-close::before {
+    content: "\E0C7";
+    /* close icon is larger so we re-size it to fit other icons */
+    font-size: 20px;
+    line-height: 40px;
+}
+
+.action-close:not([disabled]):hover::before {
+    content: "\E0CA";
+}