update ruoyi-ui/src/assets/styles/element-ui.scss.

-// cover some element-ui styles
-
-.el-breadcrumb__inner,
-.el-breadcrumb__inner a {
-  font-weight: 400 !important;
-}
-
-.el-upload {
-  input[type="file"] {
-    display: none !important;
-  }
-}
-
-.el-upload__input {
-  display: none;
-}
-
-.cell {
-  .el-tag {
-    margin-right: 0px;
-  }
-}
-
-.small-padding {
-  .cell {
-    padding-left: 5px;
-    padding-right: 5px;
-  }
-}
-
-.fixed-width {
-  .el-button--mini {
-    padding: 7px 10px;
-    width: 60px;
-  }
-}
-
-.status-col {
-  .cell {
-    padding: 0 10px;
-    text-align: center;
-
-    .el-tag {
-      margin-right: 0px;
-    }
-  }
-}
-
-// to fixed https://github.com/ElemeFE/element/issues/2461
-.el-dialog {
-  transform: none;
-  left: 0;
-  position: relative;
-  margin: 0 auto;
-}
-
-// refine element ui upload
-.upload-container {
-  .el-upload {
-    width: 100%;
-
-    .el-upload-dragger {
-      width: 100%;
-      height: 200px;
-    }
-  }
-}
-
-// dropdown
-.el-dropdown-menu {
-  a {
-    display: block
-  }
-}
-
-// fix date-picker ui bug in filter-item
-.el-range-editor.el-input__inner {
-  display: inline-flex !important;
-}
-
-// to fix el-date-picker css style
-.el-range-separator {
-  box-sizing: content-box;
-}
+// cover some element-ui styles
+
+.el-breadcrumb__inner,
+.el-breadcrumb__inner a {
+  font-weight: 400 !important;
+}
+
+.el-upload {
+  input[type="file"] {
+    display: none !important;
+  }
+}
+
+.el-upload__input {
+  display: none;
+}
+
+.cell {
+  .el-tag {
+    margin-right: 0px;
+  }
+}
+
+.small-padding {
+  .cell {
+    padding-left: 5px;
+    padding-right: 5px;
+  }
+}
+
+.fixed-width {
+  .el-button--mini {
+    padding: 7px 10px;
+    width: 60px;
+  }
+}
+
+.status-col {
+  .cell {
+    padding: 0 10px;
+    text-align: center;
+
+    .el-tag {
+      margin-right: 0px;
+    }
+  }
+}
+
+// to fixed https://github.com/ElemeFE/element/issues/2461
+.el-dialog {
+  transform: none;
+  left: 0;
+  position: relative;
+  margin: 0 auto;
+}
+
+// refine element ui upload
+.upload-container {
+  .el-upload {
+    width: 100%;
+
+    .el-upload-dragger {
+      width: 100%;
+      height: 200px;
+    }
+  }
+}
+
+// dropdown
+.el-dropdown-menu {
+  a {
+    display: block
+  }
+}
+
+// fix date-picker ui bug in filter-item
+.el-range-editor.el-input__inner {
+  display: inline-flex !important;
+}
+
+// to fix el-date-picker css style
+.el-range-separator {
+  box-sizing: content-box;
+}
+
+.el-menu--collapse
+  > div
+  > .el-submenu
+  > .el-submenu__title
+  .el-submenu__icon-arrow {
+  display: none;
+}