fix https://github.com/b3log/solo/issues/12858

owmx-3.0/css/base.scss

@@ -23,7 +23,7 @@ Version:	1.0
 Date:		2010-09-13
 Editor:		Jonas Jacek
 License:	CC Attribution-Share Alike 3.0 Unported
-Update: 	Dongxu Wang 2011-02-24 
+Update: 	Dongxu Wang 2011-02-24
                         @ http://dx.b3log.org
 ==================================================*/
 /*
@@ -107,7 +107,7 @@ a.selected {
   color: #000000;
 }
 
-H1, H3, H4, H5, H6 {
+.h2, .h4 {
   background: url(../images/ai4.png) no-repeat 0 7px;
   border-bottom: 1px solid #CCC;
   color: #666;
@@ -116,30 +116,18 @@ H1, H3, H4, H5, H6 {
   padding: 0 0 0 25px;
 }
 
-H1 {
+.h2 {
   background: url(../images/ai4.png) no-repeat 0 6px;
   font-size: 15px;
 }
 
-H1 a {
+.h2 a {
   font-weight: bold;
   font-size: 15px;
 }
 
-H2 {
-  font-size: 14px;
-  margin: 0 0 20px 0;
-}
-
-H3 {
-  background: url(../images/ai5.png) no-repeat 0 7px;
-}
-
-H3, H4, H5, H6 {
+.h4 {
   font-size: 13px;
-}
-
-h4 {
   background-position: 0 5px;
 }
 
@@ -156,6 +144,7 @@ a.sup {
   &:link {
     color: #444;
   }
+
   &:hover {
     color: #444;
   }