WEB-621:fix improve form field and stepper spacing globally (#3043)

improve

src/main.scss

@@ -607,6 +607,8 @@
 }
 
 .mat-mdc-form-field {
+  margin-bottom: 16px;
+
   .mat-mdc-input-element::placeholder {
     font-size: 14px !important;
     color: #999 !important;
@@ -617,6 +619,16 @@
   }
 }
 
+mat-stepper {
+  ::ng-deep .mat-vertical-content {
+    padding: 16px;
+  }
+
+  ::ng-deep .mat-vertical-stepper-content {
+    padding-top: 16px;
+  }
+}
+
 @media (width <=768px) {
   .flex-lt-md-50 {
     flex: 0 0 50%;