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index cb4f8e9..f9ead4b 100644
--- a/frontend/textbooks/physics8_electro.html
+++ b/frontend/textbooks/physics8_electro.html
@@ -9,6 +9,7 @@
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diff --git a/frontend/textbooks/physics8_optics.html b/frontend/textbooks/physics8_optics.html
index e4a9819..48dadb6 100644
--- a/frontend/textbooks/physics8_optics.html
+++ b/frontend/textbooks/physics8_optics.html
@@ -9,6 +9,7 @@
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diff --git a/frontend/textbooks/physics8_thermal.html b/frontend/textbooks/physics8_thermal.html
index 5b5c7cf..a7b7442 100644
--- a/frontend/textbooks/physics8_thermal.html
+++ b/frontend/textbooks/physics8_thermal.html
@@ -9,6 +9,7 @@
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