[fractal] content: Fix unwanted rounded corners in location preview

[Kévin Commaille <kcommaille src gnome org>]

commit 4e355341a39882a581f3816b95b5c3920978cca4
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Sun Oct 2 17:32:07 2022 +0200

    content: Fix unwanted rounded corners in location preview

 data/resources/style.css                      | 5 -----
 data/resources/ui/content-message-location.ui | 4 ++++
 2 files changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/data/resources/style.css b/data/resources/style.css
index b0c84e9d2..1e2974c21 100644
--- a/data/resources/style.css
+++ b/data/resources/style.css
@@ -184,11 +184,6 @@ media-content-viewer controls {
   min-width: 300px;
 }
 
-location-viewer .map {
-  border-radius: 6px;
-  background-color: @borders;
-}
-
 location-viewer .map-marker {
   color: @accent_color;
 }
diff --git a/data/resources/ui/content-message-location.ui b/data/resources/ui/content-message-location.ui
index 0eea651c0..607b13976 100644
--- a/data/resources/ui/content-message-location.ui
+++ b/data/resources/ui/content-message-location.ui
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <template class="ContentMessageLocation" parent="GtkWidget">
+    <style>
+      <class name="thumbnail"/>
+    </style>
+    <property name="overflow">hidden</property>
     <child>
       <object class="ComponentsLocationViewer" id="location"/>
     </child>