fix pdf margins

Makefile

@@ -36,11 +36,12 @@ $(DEST_DIR)/issue-%.pdf: issues/%
 		--file-scope \
 		--from markdown \
 		--to latex \
-		--pdf-engine xelatex \
+		--standalone \
 		--table-of-contents \
 		--lua-filter increase-header-levels.lua \
 		--variable title:"tildeverse zine $@" \
-		--standalone \
+		--variable geometry:margin=.75in \
+		--pdf-engine xelatex \
 		--output $@ \
 		$</*.md