Minor improvements

Author: RoyalIcing

.tool-versions

@@ -1,4 +1,4 @@
 nodejs 12.19.0
 elixir 1.10.4-otp-23
 erlang 23.1
-python 3.7.3
+python 3.9.1

apps/components_guide_web/assets/css/app.css

@@ -141,11 +141,11 @@ pre {
   --heading-1-size: var(--size-5xl);
   --heading-1-spacing: var(--size-base) 0;
   --heading-1-align: center;
-  --heading-2-size: var(--size-3xl);
+  --heading-2-size: var(--size-4xl);
   --heading-2-spacing: var(--size-base) 0;
-  --heading-3-size: var(--size-2xl);
+  --heading-3-size: var(--size-3xl);
   --heading-3-spacing: var(--size-base) 0;
-  --heading-4-size: var(--size-xl);
+  --heading-4-size: var(--size-2xl);
   --heading-4-spacing: var(--size-base) 0;
   --paragraph-spacing: 0.5rem 0;
   --listitem-spacing: 0.5rem 0;

apps/components_guide_web/lib/components_guide_web/templates/composable_systems/desirable-properties.html.md

@@ -74,17 +74,17 @@ abc
 - *e.g. a Git commit*
 - *e.g. a YouTube video cannot be edited*
 
-<h2 id=stateless>Stateless</h2>
+<h3 id=stateless>Stateless</h3>
 
 - Is [Deterministic](#deterministic)
-- *e.g. A Restful 
+- *e.g. Restful HTTP GET request*
 
-<h2 id=idempotent>Idempotent</h2>
+<h3 id=idempotent>Idempotent</h3>
 
-- e.g. receiving at least once events
+- *e.g. At-least-once event delivery*
 - Could use Random identifier in request to record which commands have already been completed
 
-<h2 id=versioned>Versioned</h2>
+<h3 id=versioned>Versioned</h3>
 
 - Won't break previous usages
 - *e.g. [Stripe’s API Versioning](https://stripe.com/blog/api-versioning)*