Edited ch12_mining.adoc with Atlas code editor

ch12_mining.adoc

@@ -778,6 +778,8 @@ numerically less than the target. If we decrease the target, the task of
 finding a hash that is less than the target becomes more and more
 difficult.
 
+++++
+<p class="fix_tracking">
 To give a simple analogy, imagine a game where players throw a pair of
 dice repeatedly, trying to throw less than a specified target. In the
 first round, the target is 12. Unless you throw double-six, you win. In
@@ -788,6 +790,8 @@ therefore be invalid. It takes more dice throws to win
 the lower the target gets. Eventually, when the target is 3 (the minimum
 possible), only one throw out of every 36, or about 3% of them, will produce a
 winning result.
+</p>
+++++
 
 From the perspective of an observer who knows that the target of the
 dice game is 3, if someone has succeeded in casting a winning throw it