ui: 优化题目标签显示

packages/ui-default/components/problem/tag.page.styl

@@ -3,6 +3,7 @@
   padding: 0 !important
   list-style: none !important
   font-size: 0
+  word-break: keep-all
 
 .problem__tag
   display: inline-block
@@ -14,7 +15,7 @@
 .problem__tag-item
   padding: rem(0px)
   margin-left: rem(3px)
-  margin-bottom: rem(2px)
+  margin-bottom: rem(5px)
   &:hover
     text-decoration: none