Update example styles

Author: sarah-j-lancaster

demo/src/main.css

@@ -134,13 +134,13 @@ footer {
     margin-top: 10px;
 }
 .code__button {
-    font-weight: bold;
     cursor: pointer;
     display: inline-block;
     padding: 10px 0;
     color: var(--colorPageLinks);
     background-color: transparent;
-    font: inherit;
+    font: 16px/1.5 sans-serif;
+    font-weight: bold;
     border: none;
     text-decoration: underline solid var(--colorGreenShadow);
 }

src/components/AccordionItemHeading.tsx

@@ -34,7 +34,6 @@ const Heading = React.forwardRef<HTMLHeadingElement, AccordianItemHeadingProps>(
         });
     },
 );
-
 Heading.displayName = 'Heading';
 
 export class AccordionItemHeading extends React.PureComponent<AccordianItemHeadingProps> {

src/css/fancy-example.css

@@ -11,7 +11,10 @@
 .accordion__item + .accordion__item {
     border-top: 1px solid rgba(0, 0, 0, 0.1);
 }
-
+.accordion__heading {
+    margin: 0;
+    font: 16px/1.5 sans-serif;
+}
 .accordion__button {
     background-color: #f4f4f4;
     color: #444;
@@ -21,6 +24,7 @@
     text-align: left;
     border: none;
     font: inherit;
+    margin: 0;
 }
 
 .accordion__button:hover {