Fix display of normative optional blocks used as algorithm steps (#641)

Author: rkirsling

css/elements.css

@@ -1561,6 +1561,10 @@ li.menu-search-result-term::before {
   padding-right: 5px;
 }
 
+emu-normative-optional {
+  display: block;
+}
+
 emu-normative-optional::before {
   display: block;
   color: var(--attributes-tag-foreground-color);
@@ -1572,7 +1576,6 @@ emu-normative-optional,
 [deprecated],
 [legacy] {
   border-left: 5px solid var(--normative-optional-border-color);
-  display: block;
   padding: 0.5em;
   background: var(--normative-optional-background-color);
 }

test/baselines/generated-reference/assets-inline.html

@@ -3173,6 +3173,10 @@
   padding-right: 5px;
 }
 
+emu-normative-optional {
+  display: block;
+}
+
 emu-normative-optional::before {
   display: block;
   color: var(--attributes-tag-foreground-color);
@@ -3184,7 +3188,6 @@
 [deprecated],
 [legacy] {
   border-left: 5px solid var(--normative-optional-border-color);
-  display: block;
   padding: 0.5em;
   background: var(--normative-optional-background-color);
 }