Remove unused global selector and class name selector (#1031)

Author: blindaa121

packages/docusaurus-theme-openapi-docs/src/theme/ApiExplorer/ApiCodeBlock/Line/_Line.scss

@@ -8,13 +8,6 @@ the background in custom CSS file due bug https://github.com/facebook/docusaurus
   --docusaurus-highlighted-code-line-bg: rgb(100 100 100);
 }
 
-.theme-code-block-highlighted-line {
-  background-color: var(--docusaurus-highlighted-code-line-bg);
-  display: block;
-  margin: 0 calc(-1 * var(--ifm-pre-padding));
-  padding: 0 var(--ifm-pre-padding);
-}
-
 .openapi-explorer__code-block-code-line {
   display: table-row;
   counter-increment: line-count;
@@ -36,11 +29,6 @@ the background in custom CSS file due bug https://github.com/facebook/docusaurus
   opacity: 0.4;
 }
 
-:global(.theme-code-block-highlighted-line)
-  .openapi-explorer__code-block-code-line-number::before {
-  opacity: 0.8;
-}
-
 .openapi-explorer__code-block-code-line-number {
   padding-right: var(--ifm-pre-padding);
 }