diff --git a/packages/fps-importer/index.ts b/packages/fps-importer/index.ts
index 4be9d6ff..40a877bd 100644
--- a/packages/fps-importer/index.ts
+++ b/packages/fps-importer/index.ts
@@ -59,7 +59,7 @@ class FpsProblemImportHandler extends Handler {
                 memory: p.memory_limit[0]._ + p.memory_limit[0].$.unit,
             };
             const title = decodeHTML(p.title.join(' '));
-            const tags = _.filter(p.source, (i: string) => i.trim());
+            const tags = _.filter(p.source, (i: string) => i.trim()).flatMap((i) => i.split(' ')).filter((i) => i);
             const pid = await ProblemModel.add(domainId, null, title, buildContent(content, 'html'), this.user._id, tags);
             const tasks = [
                 ProblemModel.edit(domainId, pid, { html: true }),
diff --git a/packages/ui-default/backendlib/markdown-it-xss.ts b/packages/ui-default/backendlib/markdown-it-xss.ts
index 185ce0ee..0153ec6d 100644
--- a/packages/ui-default/backendlib/markdown-it-xss.ts
+++ b/packages/ui-default/backendlib/markdown-it-xss.ts
@@ -75,12 +75,12 @@ export const xss = new Xss.FilterXSS({
     li: [],
     mark: [],
     ol: [],
-    p: [],
+    p: ['align', 'style'],
     pre: [],
     s: [],
     section: [],
     small: [],
-    span: ['class'],
+    span: ['class', 'style'],
     sub: [],
     summary: [],
     sup: [],
@@ -98,6 +98,16 @@ export const xss = new Xss.FilterXSS({
     var: [],
     video: ['autoplay', 'controls', 'loop', 'preload', 'src', 'height', 'width'],
   },
+  css: {
+    whiteList: {
+      'font-size': true,
+      'font-family': true,
+      'text-align': true,
+      'text-indent': true,
+      'margin-left': true,
+      color: true,
+    },
+  },
   allowCommentTag: false,
   stripIgnoreTagBody: ['script'],
   safeAttrValue(tag, name, value) {