Fix line highlights, lol

_sass/2017/markdown/code.scss

@@ -37,11 +37,11 @@
 
   // Line highlight
   .line-highlight {
-    transform: translate3d(0, 1px, 0);
+    transform: translate3d(0, 2px, 0);
     background: linear-gradient(
       to right,
-      mix($base-c, white, 5%) 25%,
+      rgba($base-c, 0.05) 25%,
-      white);
+      transparent);
   }
 
   // Line highlight ranges

jest.md

@@ -16,6 +16,7 @@ Testing
 ```bash
 npm install --save-dev jest babel-jest
 ```
+{: data-line="1"}
 
 ```js
 /* Add to package.json */