Merge branch 'hotfix/box-sizing' of https://gitee.com/preschooler/platform-admin-ui

src/styles/var.css

@@ -64,3 +64,11 @@ body {
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
+
+*,
+:after,
+:before {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}