Merge branch '722-fix-volume-bg' into 'develop'

Fix #722 : non transparent volume range background

Closes #722

See merge request funkwhale/funkwhale!626

changes/changelog.d/722.bugfix

+Fixed non-transparent background for volume range on Firefox (#722)
\ No newline at end of file

front/src/components/audio/Player.vue

@@ -499,6 +499,7 @@ export default {
     bottom: 1.1rem;
     left: 25%;
     cursor: pointer;
+    background-color: transparent;
   }
   input[type="range"]:focus {
     outline: none;