Merge pull request '#67 feat: imrpvoe the css' (#69) from fix-css-layer into develop

Reviewed-on: https://git.openi.org.cn/OpenI/aiforge/pulls/69
Reviewed-by: colorfulberry <senluowanxiangt@163.com>

web_src/less/_base.less

@@ -1297,10 +1297,6 @@ i.icon.centerlock {
     vertical-align: middle !important;
 }
 
-.ui.grid>.column:not(.row),
-.ui.grid>.row>.column {
-    z-index: 0,
-}
 .ui.search.action.input > input {
     width: auto;
 }

web_src/less/openi.less

@@ -5,10 +5,10 @@
 	color: #f2711c!important
 }
 .mb-1 {
-	margin-bottom: 8px;
+	margin-bottom: 8px !important;
 }
 .mb-2 {
-  margin-bottom: 16px;
+	margin-bottom: 16px !important;
 }
 .following.bar #navbar .brand{
 	padding-left: 0;