fix(styles): Spoiler trigger zindex, close modal button position (#2406)

#2338

app/assets/stylesheets/components.scss

@@ -1858,7 +1858,9 @@ button.icon-button.active i.fa-retweet {
 .spoiler-button {
   left: 4px;
   position: absolute;
+  text-shadow: 0px 1px 1px #000, 1px 0px 1px #000;
   top: 4px;
+  z-index: 100;
 }
 
 .modal-container--preloader {
@@ -2563,8 +2565,8 @@ button.icon-button.active i.fa-retweet {
 
 .media-modal__close {
   position: absolute;
-  right: 4;
-  top: 4;
+  right: 4px;
+  top: 4px;
   z-index: 100;
 }