TCA-550 - move sizes for social share preview in a mixin

Author: vas3a

src-ts/lib/styles/mixins/_layout.mixins.scss

@@ -22,6 +22,11 @@
     width: 100%;
 }
 
+@mixin socialPreviewImg {
+    width: 1200px;
+    height: 630px;
+}
+
 @mixin scrollbar {
     // firefox's solution for "customizing" scrollbars
     & {

src-ts/tools/learn/course-certificate/certificate-view/CertificateView.module.scss

@@ -53,8 +53,7 @@
 
     &:global(.large-container) {
         aspect-ratio: unset;
-        width: 1200px;
-        height: 630px;
+        @include socialPreviewImg;
     }
 }