分离公共 js；修改 footer 效果，固定在底部

static/src/css/admin.css

@@ -1,25 +1,15 @@
+@import url("global.css");
 @import url("bootstrap/bootstrap.min.css");
 @import url("bootstrap/todc-bootstrap.min.css");
 @import url("codeMirror/codemirror.css");
 @import url("simditor/simditor.css");
 @import url("webuploader/webuploader.css");
 @import url("datetime_picker/bootstrap-datetimepicker.css");
-html, body {
-    height: 100%;
-}
 
-img {
-    max-width: 100%;
-    height: auto;
-}
-
-.footer {
-    padding-top: 30px;
-    padding-bottom: 30px;
-    float: bottom;
-    bottom: 0;
-}
-
-label {
-    font-size: 16px;
+#loading-gif{
+    width: 40px;
+    height: 40px;
+    margin: auto;
+    position: absolute;
+    top: 0; left: 0; bottom: 0; right: 0;
 }