Improve file thumbnail channel layout

src/components/file_mode/ThumbnailView.vue

@@ -8,8 +8,8 @@
         <v-img v-else-if="item.event.getContent().msgtype == 'm.image' && item.src" :aspect-ratio="previewOnly ? (16 / 9) : undefined" :class="{'thumbnail-item': true, 'preview': previewOnly}" :src="item.src" :contain="!previewOnly" :cover="previewOnly" />
         <div v-else :class="{'thumbnail-item': true, 'preview': previewOnly, 'file-item': true}" >
             <v-icon :class="fileTypeIconClass">{{ fileTypeIcon }}</v-icon>
-            <b>{{ $sanitize(fileName) }}</b>
-            <div>{{ fileSize }}</div>
+            <div class="file-name">{{ $sanitize(fileName) }}</div>
+            <div class="file-size">{{ fileSize }}</div>
         </div>
     </div>
 </template>