Edited ch04_keys.adoc with Atlas code editor

ch04_keys.adoc

@@ -120,6 +120,7 @@ use to pick that number does not matter as long as it is not predictable
 or repeatable. Bitcoin software uses cryptographically secure random
 number generators to produce 256 bits of entropy.
 
+[role="less_space pagebreak-before"]
 More precisely, the private key can be any number between 0 and _n_ -
 1 inclusive, where _n_ is a constant (_n_ = 1.1578 × 10^77^, slightly less
 than 2^256^) defined as the order of the elliptic curve used in Bitcoin
@@ -170,7 +171,7 @@ curve.
 by Bitcoin.
 
 [[ecc-curve]]
-[role="width-30"]
+[role="width-50"]
 .An elliptic curve
 image::images/mbc3_0402.png["ecc-curve"]