Edited ch12_mining.adoc with Atlas code editor

ch12_mining.adoc

@@ -819,6 +819,8 @@ $ echo "Hello, world! 32" | sha256sum
 09cb91f8250df04a3db8bd98f47c7cecb712c99835f4123e8ea51460ccbec314  -
 ----
 
+++++
+<p class="fix_tracking3">
 Although it only takes one hash computation to verify, it took
 us 32 hash computations to find a nonce that worked. If we had a lower
 target (higher difficulty), it would take many more hash computations to
@@ -826,6 +828,8 @@ find a suitable nonce, but only one hash computation for anyone to
 verify. Furthermore, by knowing the target, anyone can estimate the
 difficulty using statistics and therefore know roughly how much work was needed
 to find such a nonce.
+</p>
+++++
 
 [TIP]
 ====