minify clounds image

angular.json

               "optimization": true,
               "outputHashing": "all",
               "sourceMap": false,
-              "extractCss": false,
+              "extractCss": true,
               "namedChunks": false,
               "aot": true,
               "extractLicenses": false,

src/app/page-header/default-page-header/default-page-header.component.html

-<div
-  class="page-header section-dark default-header"
->
+<div class="page-header section-dark default-header">
   <div class="filter"></div>
   <div class="slide-in-right">
     <div class="title-brand text-left">
   </div>
   <div
     class="moving-clouds"
-    style="background-image: url('assets/img/clouds.png');"
+    style="
+      background: url('assets/img/clouds.png') no-repeat;
+      background-size: cover;
+    "
   ></div>
 </div>