diff --git a/share/base.css b/share/base.css
index aee1193..533a67f 100644
--- a/share/base.css
+++ b/share/base.css
@@ -41,7 +41,6 @@ span {
 }
 ._ {
   color:transparent;
-  font-size:1px;
 }
 ::selection{
   background: rgba(127,255,255,1);
diff --git a/src/HTMLRenderer/export.cc b/src/HTMLRenderer/export.cc
index 4b8193f..fa5a706 100644
--- a/src/HTMLRenderer/export.cc
+++ b/src/HTMLRenderer/export.cc
@@ -35,7 +35,15 @@ void HTMLRenderer::export_remote_font(const FontInfo & info, const string & suff
         }
     }
 
-    css_fout << ")format(\"" << fontfileformat << "\");}.f" << info.id << "{font-family:f" << info.id << ";line-height:" << _round(info.ascent - info.descent) << ";}" << endl;
+    css_fout << ")format(\"" << fontfileformat << "\");}.f" << info.id << "{font-family:f" << info.id << ";line-height:" << _round(info.ascent - info.descent) << ";}";
+
+    // when ' ' is not vaild in the font, when we use ' ' in padding
+    // the browser will use the fallback font, whose metrics could be (very) different, then the layout will be affected
+    // so set the font-zie to avoid being affected
+    if(!(info.has_space))
+        css_fout << ".f" << info.id << ">._{font-size:1px;}";
+
+    css_fout << endl;
 }
 
 static string general_font_family(GfxFont * font)
diff --git a/src/HTMLRenderer/text.cc b/src/HTMLRenderer/text.cc
index 5ad0f17..7ddc7e0 100644
--- a/src/HTMLRenderer/text.cc
+++ b/src/HTMLRenderer/text.cc
@@ -171,6 +171,7 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
         *iter = tolower(*iter);
 
     info.use_tounicode = (is_truetype_suffix(suffix) || (param->tounicode > 0));
+    info.has_space = false;
 
     const char * used_map = nullptr;
 
@@ -321,6 +322,9 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
                     u = unicode_from_font(i, font);
                 }
 
+                if(u == ' ')
+                    info.has_space = true;
+
                 if(codeset.insert(u).second)
                 {
                     cur_mapping[k] = u;
diff --git a/src/include/util.h b/src/include/util.h
index d93e93a..18cd4b4 100644
--- a/src/include/util.h
+++ b/src/include/util.h
@@ -110,6 +110,7 @@ public:
     long long id;
     bool use_tounicode;
     double ascent, descent;
+    bool has_space; // whether space is included in the font
 };
 
 // wrapper of the transform matrix double[6]