spelling, backgroung color at end

content/security/risks/slides.md

@@ -154,7 +154,7 @@ fn random(subject: &[u8]) -> (T::Hash, BlockNumberFor<T>) {
 
 ### Case Study - VRF
 
-- There are two main secure approaches to blockchain randomness in production today: RANDAO and VRF. **Polkadot uses VRF**.
+- There are two main secure approaches to blockchain randomness in production today: [RANDAO](https://github.com/randao/randao) and VRF. **Polkadot uses VRF**.
 
   > **VRF**: mathematical operation that takes some input and produces a random number along with a proof of authenticity that this random number was generated by the submitter.
 
@@ -590,7 +590,7 @@ benchmarks! {
 
 - Primary goal is to keep the runtime safe.
 - Secondary goal is to be as accurate as possible to maximize throughput.
-- For non-hard deadline code use **meteoring**.
+- For non-hard deadline code use **metering**.
 
 ---v
 
@@ -1204,7 +1204,7 @@ fn test_unsafe_dispatch_whitelisted_call_stack_overflow() {
 		let mut call_hash = <Test as frame_system::Config>::Hashing::hash(&encoded_call[..]);
 
 		// The amount of nested calls to create
-		// This test will not crash as it the following value is less than minimun
+		// This test will not crash as it the following value is less than minimum
 		// amount of calls to cause a stack overflow
 		let nested_calls = sp_api::MAX_EXTRINSIC_DEPTH;
 
@@ -1460,4 +1460,6 @@ fn decode_concatenated_extrinsics(
 
 ---
 
+<!-- .slide: data-background-color="#4A2439" -->
+
 ### Questions