diff --git a/preface.asciidoc b/preface.asciidoc
index fb4d1e56..d1ac2e78 100644
--- a/preface.asciidoc
+++ b/preface.asciidoc
@@ -126,7 +126,7 @@ Watch us on YouTube: link:$$https://youtube.com/oreillymedia$$[].
 === Contacting the Authors
 
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-<p class="align">
+<p class="left-align">
 You can contact Andreas M. Antonopoulos on his personal site:
 <span class="keep-together"><a href="https://antonopoulos.com">https://antonopoulos.com</a>.</span></p>
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