diff --git a/_external/Montserrat-Bold.ttf b/_external/Montserrat-Bold.ttf
new file mode 100644
index 0000000..ae33a45
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diff --git a/_external/Montserrat-Regular.ttf b/_external/Montserrat-Regular.ttf
new file mode 100644
index 0000000..5b4b5af
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diff --git a/_external/OpenSans-Bold.ttf b/_external/OpenSans-Bold.ttf
new file mode 100644
index 0000000..fd79d43
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diff --git a/_external/OpenSans-BoldItalic.ttf b/_external/OpenSans-BoldItalic.ttf
new file mode 100644
index 0000000..9bc8009
Binary files /dev/null and b/_external/OpenSans-BoldItalic.ttf differ
diff --git a/_external/OpenSans-ExtraBold.ttf b/_external/OpenSans-ExtraBold.ttf
new file mode 100644
index 0000000..21f6f84
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diff --git a/_external/OpenSans-ExtraBoldItalic.ttf b/_external/OpenSans-ExtraBoldItalic.ttf
new file mode 100644
index 0000000..31cb688
Binary files /dev/null and b/_external/OpenSans-ExtraBoldItalic.ttf differ
diff --git a/_external/OpenSans-Italic.ttf b/_external/OpenSans-Italic.ttf
new file mode 100644
index 0000000..c90da48
Binary files /dev/null and b/_external/OpenSans-Italic.ttf differ
diff --git a/_external/OpenSans-Light.ttf b/_external/OpenSans-Light.ttf
new file mode 100644
index 0000000..0d38189
Binary files /dev/null and b/_external/OpenSans-Light.ttf differ
diff --git a/_external/OpenSans-LightItalic.ttf b/_external/OpenSans-LightItalic.ttf
new file mode 100644
index 0000000..68299c4
Binary files /dev/null and b/_external/OpenSans-LightItalic.ttf differ
diff --git a/_external/OpenSans-Regular.ttf b/_external/OpenSans-Regular.ttf
new file mode 100644
index 0000000..db43334
Binary files /dev/null and b/_external/OpenSans-Regular.ttf differ
diff --git a/_external/OpenSans-Semibold.ttf b/_external/OpenSans-Semibold.ttf
new file mode 100644
index 0000000..1a7679e
Binary files /dev/null and b/_external/OpenSans-Semibold.ttf differ
diff --git a/_external/OpenSans-SemiboldItalic.ttf b/_external/OpenSans-SemiboldItalic.ttf
new file mode 100644
index 0000000..59b6d16
Binary files /dev/null and b/_external/OpenSans-SemiboldItalic.ttf differ
diff --git a/_external/lato.css b/_external/lato.css
index 64c1cf8..8aa4469 100644
--- a/_external/lato.css
+++ b/_external/lato.css
@@ -2,23 +2,23 @@
   font-family: 'Lato';
   font-style: normal;
   font-weight: 400;
-  src: local('Lato Regular'), local('Lato-Regular'), url(9k-RPmcnxYEPm8CNFsH2gg.woff) format('woff');
+  src: local('Lato Regular'), local('Lato-Regular'), url('Lato-Regular.ttf');
 }
 @font-face {
   font-family: 'Lato';
   font-style: normal;
   font-weight: 700;
-  src: local('Lato Bold'), local('Lato-Bold'), url(wkfQbvfT_02e2IWO3yYueQ.woff) format('woff');
+  src: local('Lato Bold'), local('Lato-Bold'), url('Lato-Bold.ttf');
 }
 @font-face {
   font-family: 'Lato';
   font-style: italic;
   font-weight: 400;
-  src: local('Lato Italic'), local('Lato-Italic'), url(oUan5VrEkpzIazlUe5ieaA.woff) format('woff');
+  src: local('Lato Italic'), local('Lato-Italic'), url('Lato-Italic.ttf');
 }
 @font-face {
   font-family: 'Lato';
   font-style: italic;
   font-weight: 700;
-  src: local('Lato Bold Italic'), local('Lato-BoldItalic'), url(HkF_qI1x_noxlxhrhMQYED8E0i7KZn-EPnyo3HZu7kw.woff) format('woff');
+  src: local('Lato Bold Italic'), local('Lato-BoldItalic'), url('Lato-BoldItalic.ttf');
 }
diff --git a/_external/montserrat.css b/_external/montserrat.css
new file mode 100644
index 0000000..895f76b
--- /dev/null
+++ b/_external/montserrat.css
@@ -0,0 +1,6 @@
+@font-face {
+  font-family: 'Montserrat';
+  font-style: normal;
+  font-weight: 700;
+  src: local('Montserrat-Bold'), url('Montserrat-Bold.ttf');
+}
diff --git a/_external/night.css b/_external/night.css
index e8703a5..51469e4 100644
--- a/_external/night.css
+++ b/_external/night.css
@@ -1,5 +1,5 @@
-@import url(https://fonts.googleapis.com/css?family=Montserrat:700);
-@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);
+@import url(montserrat.css);
+@import url(opensans.css);
 /**
  * Black theme for reveal.js.
  *
diff --git a/_external/opensans.css b/_external/opensans.css
new file mode 100644
index 0000000..f786e62
--- /dev/null
+++ b/_external/opensans.css
@@ -0,0 +1,24 @@
+@font-face {
+  font-family: 'Open Sans';
+  font-style: normal;
+  font-weight: 400;
+  src: local('Open Sans'), local('OpenSans'), url('OpenSans-Regular.ttf');
+}
+@font-face {
+  font-family: 'Open Sans';
+  font-style: normal;
+  font-weight: 700;
+  src: local('Open Sans Bold'), local('OpenSans-Bold'), url('OpenSans-Bold.ttf');
+}
+@font-face {
+  font-family: 'Open Sans';
+  font-style: italic;
+  font-weight: 400;
+  src: local('Open Sans Italic'), local('OpenSans-Italic'), url('OpenSans-Italic.ttf');
+}
+@font-face {
+  font-family: 'Open Sans';
+  font-style: italic;
+  font-weight: 700;
+  src: local('Open Sans Bold Italic'), local('OpenSans-BoldItalic'), url('OpenSans-BoldItalic.ttf');
+}