js-interaction-test-blocker-element.css
.blocker-element {
  /* Position the box over the target. */
  position: relative;
  z-index: 1;
  top: -30px;
  left: -5px;
  /* Size the box to cover the target. */
  width: 500px;
  height: 40px;
  opacity: 0.5;
  /* Make the blocker element visible. */
  background-color: black;
}
  
File
- 
              core/modules/ system/ tests/ modules/ js_interaction_test/ css/ js-interaction-test-blocker-element.css 
View source
- .blocker-element {
-   /* Position the box over the target. */
-   position: relative;
-   z-index: 1;
-   top: -30px;
-   left: -5px;
-   /* Size the box to cover the target. */
-   width: 500px;
-   height: 40px;
-   opacity: 0.5;
-   /* Make the blocker element visible. */
-   background-color: black;
- }
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