more minor css changes

-posterdown_html
   - added `sectitle_textsize:` option
   - changed come css to ensure normal font weights rather than bold
diff --git a/inst/rmarkdown/templates/posterdown_betterport/resources/template.html b/inst/rmarkdown/templates/posterdown_betterport/resources/template.html
index ce3fbee..57f0b95 100644
--- a/inst/rmarkdown/templates/posterdown_betterport/resources/template.html
+++ b/inst/rmarkdown/templates/posterdown_betterport/resources/template.html
@@ -201,7 +201,7 @@
 line-height: 85%;
 font-size: $authorextra_textsize$;
 }
-.outer h1 {
+.outer h1, h2, h3, h4, h5, h6 {
 text-align: center;
 margin-top: 0.5in;
 margin-bottom: 0.5in;
diff --git a/inst/rmarkdown/templates/posterdown_html/resources/template.html b/inst/rmarkdown/templates/posterdown_html/resources/template.html
index 3d14952..fad4770 100644
--- a/inst/rmarkdown/templates/posterdown_html/resources/template.html
+++ b/inst/rmarkdown/templates/posterdown_html/resources/template.html
@@ -141,10 +141,8 @@
 .poster_title h1 {
 font-size: $title_textsize$;
 margin: 0;
-padding: 0;
 border: 0;
-padding-top: 1cm;
-padding-bottom: 0;
+font-weight: normal;
 }
 .poster_body_wrap{
 width: $poster_width$;
@@ -156,42 +154,39 @@
 color: $author_textcol$;
 font-size: $author_textsize$;
 margin: 0;
-padding: 0;
-padding-top: 1cm;
-padding-bottom: 0.5cm;
 border: 0;
+font-weight: normal;
 }
 .poster_title h5 {
 color: $affiliation_textcol$;
 font-size: $affiliation_texsize$;
 margin: 0;
-padding: 0;
 border: 0;
-padding-top: 1cm;
+font-weight: normal;
 }
 img {
 margin-top: 2cm;
 margin-bottom: 0;
 }
 .section {
-  padding: 1cm;
+  padding: 0.2em;
 }
 .poster_body h1 {
 text-align: center;
 color: $sectitle_textcol$;
-font-size: 50pt;
+font-size: $sectitle_textsize$;
 border: $sectitle_borderwidth$ solid $sectitle_bordercol$;
 background-color: $sectitle_bgcol$;
 border-radius: $sectitle_boxshape$;
 margin-top: 2mm;
 margin-bottom: 2mm;
-padding-top: 5mm;
-padding-bottom: 5mm;
+font-weight: normal;
 }
 .poster_body h2 {
 color: $sectitle2_textcol$;
 font-size: 40pt;
 padding-left: 4mm;
+font-weight: normal;
 }
 .span h1 {
 text-align: center;
diff --git a/inst/rmarkdown/templates/posterdown_html/skeleton/skeleton.Rmd b/inst/rmarkdown/templates/posterdown_html/skeleton/skeleton.Rmd
index dc6ad37..a51d690 100644
--- a/inst/rmarkdown/templates/posterdown_html/skeleton/skeleton.Rmd
+++ b/inst/rmarkdown/templates/posterdown_html/skeleton/skeleton.Rmd
@@ -43,6 +43,7 @@
 columnline_style: dashed #style of the column line seperator.
 #SECTION TITLE STYLING
 sectitle_textcol: "#ffffff" # Colour of the poster section titles
+sectitle_textsize: "65pt"
 sectitle_bgcol: "#0b4545" # Colour of the section title box
 sectitle_bordercol: "#0b4545" # Colour of the border around the section title box.
 sectitle_borderwidth: "2mm" # Thicknes of the section title box border