Load progress bar after image on audio player (#326)

* Load progress bar after image

* Ensure bottom overlay on top

* zindex

homepage/static/custom-audio-player.js

@@ -214,6 +214,7 @@ function initCustomAudioPlayers() {
       });
 
       // Dark vertical progression bar
+      img.addEventListener("load", () => {
         indicator = document.createElement("div");
         applyStyles(indicator, {
           position: "absolute",
@@ -227,6 +228,7 @@ function initCustomAudioPlayers() {
           borderRadius: "2px",
         });
         wrapper.appendChild(indicator);
+      });
     }
 
     // Loading spinner
@@ -405,6 +407,7 @@ function initCustomAudioPlayers() {
       position: "absolute",
       left: "0",
       bottom: "0",
+      zIndex: 1,
       width: "100%",
       height: "15%",
       display: "none",