small fixes, more colors, english comments

fireworks.css

@@ -1,13 +1,15 @@
 .fireworks {
-  /*position: fixed;*/
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   pointer-events: none;
-  /*overflow: hidden;*/
   z-index: 10;
+
+  /* activate the following for fixed positioning */
+  /*position: fixed;*/
+  /*overflow: hidden;*/
 }
 
 .rocket-trail {
@@ -15,13 +17,18 @@
   left: var(--trailX);
   top: var(--trailStartY);
   width: 4px;
-  /*height: 4px;*/
+
+  /* activate the following for rocket trail */
   height: 60px;
-  /*background: white;*/
   background: linear-gradient(to bottom, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0));
   filter: blur(2px);
+
+  /* activate the following for rocket trail as a point */
+  /*height: 4px;*/
+  /*background: white;*/
   /*border-radius: 50%;
   box-shadow: 0 0 8px 2px white;*/
+
   animation: rocket-trail-animation 1s linear forwards;
 }
 
@@ -36,7 +43,7 @@
   }
 }
 
-/* Animation für die Partikel */
+/* Animation for the particles */
 @keyframes fireworkParticle {
   0% {
     opacity: 1;