fix svg render in chrome

src/Bitcoin_Merkle_Roots.mdwn

@@ -44,7 +44,7 @@ parent node. This process is repeated for each pair to create the nodes in the
 next *depth* of the Merkle tree until there is only one pair to hash. Their
 parent is the Merkle root and is the ancestor of all nodes in the tree.
 
-<figure>
+<figure style="width: calc(100% - 2px)">
 <object data="https://web.hooya.wesl.ee/cid-content/bafkreidh36erkpq4p34bbd3oz2zca6sfjz23mrbz6f4ku3jr4lfbabvbwa" type="image/svg+xml"></object>
 <figcaption>Color-mixing example of a binary Merkle tree<br/>
 Notice the content of each parent node is a function of its children</figcaption>