correcting dismissible alerts

components/alerte.vue

 <template>
-	<div class="alert" :class="classType" v-if="error">
+	<div
+		class="alert alert-dismissible fade show"
+		:class="classType"
+		v-if="error">
 		{{ error }}
 		<button type="button" class="close" data-dismiss="alert" aria-label="Close">
 			<span aria-hidden="true">&times;</span>