diff --git a/docs/common/footer.php b/docs/common/footer.php
index ea785eb..409fe06 100755
--- a/docs/common/footer.php
+++ b/docs/common/footer.php
@@ -104,7 +104,7 @@ $quote_author_arr = [
 					</span>
 					<span>
 						<a href="https://jigsaw.w3.org/css-validator/check/referer">
-							<img style="border:0;x"
+							<img style="border:0;"
 								src="https://jigsaw.w3.org/css-validator/images/vcss"
 								alt="Valid CSS!"></a>
 					</span>