Fix blind header fonts

Change-Id: I2b0983b279d91b9ac0ad8c3988330e72fa218fdc
diff --git a/dev/scss/base/mixins.scss b/dev/scss/base/mixins.scss
index 765ea76..599c19a 100644
--- a/dev/scss/base/mixins.scss
+++ b/dev/scss/base/mixins.scss
@@ -7,6 +7,7 @@
 @mixin blind {
   position:    absolute;
   margin-left: -3000px;
+  font-size:   1px;
 }
 
 
@@ -64,4 +65,4 @@
 @mixin matchinfo-head {
   border-top: $border-size solid $darker-orange; // #ff8000;
   width:      $left-width / 2;
-}
\ No newline at end of file
+}