添加Metronic（作为LFS）

frontend/static/assets/admin/pages/css/image-crop.css

@@ -0,0 +1,40 @@
+/* Apply these styles only when #preview-pane has
+   been placed within the Jcrop widget */
+#preview-pane {
+  display: block;
+  position: absolute;
+  z-index: 2000;
+  right: -200px;
+  padding: 6px;
+  border: 1px rgba(0, 0, 0, 0.4) solid;
+  background-color: white;
+  -webkit-border-radius: 6px;
+  -moz-border-radius: 6px;
+  border-radius: 6px;
+  -webkit-box-shadow: 1px 1px 5px 2px rgba(0, 0, 0, 0.2);
+  -moz-box-shadow: 1px 1px 5px 2px rgba(0, 0, 0, 0.2);
+  box-shadow: 1px 1px 5px 2px rgba(0, 0, 0, 0.2);
+}
+
+@media (max-width: 1024px) {
+  #preview-pane {
+    right: 0;
+  }
+}
+/* The Javascript code will set the aspect ratio of the crop
+   area based on the size of the thumbnail preview,
+   specified here */
+#preview-pane .preview-container {
+  width: 175px;
+  height: 150px;
+  overflow: hidden;
+}
+
+#demo7 {
+  background-color: #eee;
+  width: 500px;
+  height: 330px;
+  font-size: 24px;
+  font-weight: 300;
+  display: block;
+}