fix stars in order to take all the screen size

assets/css/style.css

@@ -21,6 +21,15 @@ body, html {
 }
 
 
+#stars1, #stars2, #stars3 {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    height: 100vh;
+    z-index: 0;
+}
+
 #background_div {
     max-height: 100vh;
     display: flex;