diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3bfa18afcbc77d00a66809ee5d15e5406e3d4e5f..1f0bb0e370cc6e643855314b6e53dfa816cda096 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: omalaspinas/pandoc:latest
+image: omalaspinas/c_pandoc:latest
 
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
diff --git a/Makefile b/Makefile
index d77f9a9b0d620eb2c18233ed73de02cfac6c6492..2d299a2557fcd1ad10fdeb721b661399dfdb3f4d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,9 @@
-STYLES := css/tufte-css/tufte.css \
-	css/pandoc.css \
-	css/pandoc-solarized.css \
-	css/tufte-extra.css
-
 OPTIONS = --toc
 OPTIONS += --filter=pandoc-numbering
 OPTIONS += --filter=pandoc-crossref
 
 PDFOPTIONS = --highlight-style kate
-PDFOPTIONS += --pdf-engine pdflatex
+PDFOPTIONS += --pdf-engine xelatex 
 PDFOPTIONS += --number-sections
 PDFOPTIONS += --template=./default.latex
 
diff --git a/examen/fourierConvo2021.md.gpg b/examen/fourierConvo2021.md.gpg
index 58e608df5e2f2fd97c95895ee4c8663d87583628..b35d1a6f5821dfde96bfbb2a8d07dd7fb5e1d53a 100644
Binary files a/examen/fourierConvo2021.md.gpg and b/examen/fourierConvo2021.md.gpg differ