Add styles to sponsor view

Author: ericof

frontend/packages/volto-techevent/news/+sponsorview.feature

@@ -0,0 +1 @@
+Add styles to sponsor view. @ericof

frontend/packages/volto-techevent/src/theme/_main.scss

@@ -13,6 +13,7 @@
 @import 'components/sponsorlevel';
 @import 'components/sponsorlist';
 @import 'components/sponsortile';
+@import 'components/sponsor_view';
 @import 'components/presenter/presenter_activities';
 @import 'components/presenter/presenter_category';
 @import 'components/presenter/presenter_tile';

frontend/packages/volto-techevent/src/theme/components/_sponsor_view.scss

@@ -0,0 +1,5 @@
+body.contenttype-sponsor {
+  #sponsorLogo {
+    @include narrow-container-width;
+  }
+}