Convert inline style css to classes.

src/components/ErrorHandler.vue

@@ -1,7 +1,7 @@
 <template>
     <p v-text="message" />
     <button @click="toggleTrace" class="btn" v-text="$t('actions.show_more')" />
-    <p ref="stacktrace" style="white-space: pre-wrap" hidden v-text="error" />
+    <p ref="stacktrace" class="whitespace-pre-wrap" hidden v-text="error" />
 </template>
 
 <script>