Update introduction.md

Author: nseidle

docs/introduction.md

@@ -38,7 +38,9 @@ The line of RTK Everywhere products offered by SparkFun all run identical firmwa
 	<center>
 	[Quickstart Guide](https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/quickstart-torch/){ .md-button .md-button--primary }
 	</center>
-	<br>
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+	<div><br></div>
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 	[Hookup Guide](https://docs.sparkfun.com/SparkFun_RTK_Torch/){ .md-button .md-button--primary }
 	</center>