Use new button variants

src/components/welcome_headers/WelcomeHeaderRoom.vue

@@ -10,7 +10,7 @@
               v-if="publicRoomLinkCopied"
               id="btn-copy-room-link"
               color="#444444"
-              depressed
+              variant="flat"
               style="position:absolute;left:0;top:0"
               class="filled-button link-copied-in-place"
               >{{ $t("room_info.link_copied") }}</v-btn
@@ -30,7 +30,7 @@
       {{ roomHistoryDescription }}
     </div>
     <div class="text-end">
-      <v-btn id="btn-got-it" text @click.stop="$emit('close')" class="text-transform-0">
+      <v-btn id="btn-got-it" variant="text" @click.stop="$emit('close')" class="text-transform-0">
         {{ $t("room_welcome.got_it") }}
       </v-btn>
     </div>