diff --git a/md_pdf/assets/static/style.scss b/md_pdf/assets/static/style.scss
index 1212730..458b7d6 100644
--- a/md_pdf/assets/static/style.scss
+++ b/md_pdf/assets/static/style.scss
@@ -6,4 +6,14 @@ body.cover {
     padding-top: 400px;
     font-size: 48px;
   }
+  & h3 {
+    font-size: 36px;
+  }
+  & h4 {
+    font-size: 18px;
+  }
+}
+body, html {
+  font-size: 12px;
+  line-height: 1.5;
 }
diff --git a/md_pdf/build/pdf.py b/md_pdf/build/pdf.py
index 39c550d..60c6b4b 100644
--- a/md_pdf/build/pdf.py
+++ b/md_pdf/build/pdf.py
@@ -7,6 +7,9 @@ import logging
 logger = logging.getLogger(__file__)
 
 
+DEFAULT_MARGIN_VERTICAL = '1.5cm'
+DEFAULT_MARGIN_HORIZONTAL = '2.5cm'
+
 STYLE_FILE = os.path.join(STATIC_DIR, 'style.css')
 HEADER_FILE = os.path.join(TEMPLATES_DIR, 'header.html')
 FOOTER_FILE = os.path.join(TEMPLATES_DIR, 'footer.html')
@@ -14,11 +17,6 @@ PDF_OPTIONS = {
     "quiet": "",
     "no-pdf-compression": "",
 
-    "margin-top": '0.6in',
-    "margin-bottom": '0.6in',
-    "margin-left": '0.4in',
-    "margin-right": '0.4in',
-
     "header-html": HEADER_FILE,
     "footer-html": FOOTER_FILE,
     "footer-spacing": 5,
@@ -31,6 +29,12 @@ PDF_OPTIONS = {
 def export_pdf(content, config):
     PDF_OPTIONS['title'] = config.get('title', 'Output')
     PDF_OPTIONS['replace'] = [(key, str(value)) for key, value in config['context'].items()]
+
+    PDF_OPTIONS['margin-top'] = config['context'].get('margin_vertical', DEFAULT_MARGIN_VERTICAL)
+    PDF_OPTIONS['margin-bottom'] = config['context'].get('margin_vertical', DEFAULT_MARGIN_VERTICAL)
+    PDF_OPTIONS['margin-left'] = config['context'].get('margin_horizontal', DEFAULT_MARGIN_HORIZONTAL)
+    PDF_OPTIONS['margin-right'] = config['context'].get('margin_horizontal', DEFAULT_MARGIN_HORIZONTAL)
+
     logger.info("Rendering PDF...")
     return pdfkit.from_string(
         content,