update user invite style

src/pages/user/UserInvitePoster.vue

@@ -5,8 +5,20 @@
 			<div v-else class="empty" v-text="message" />
 		</section>
 		<div v-if="posterImage" class="actions">
-			<t-button class="bg-white" variant="outline" theme="primary" block @click="copyLink">复制链接</t-button>
-			<t-button theme="primary" block :loading="isDownloading" @click="savePoster">保存海报</t-button>
+			<t-button
+				class="button bg-white"
+				variant="outline"
+				theme="primary"
+				block
+				@click="copyLink"
+			>复制链接</t-button>
+			<t-button
+				class="button"
+				theme="primary"
+				block
+				:loading="isDownloading"
+				@click="savePoster"
+			>保存海报</t-button>
 		</div>
 	</div>
 </template>
@@ -105,13 +117,11 @@ onMounted(() => {
 	}
 
 	.actions {
+		--td-button-border-radius: 1rem;
+
 		gap: .75rem;
-		left: 1rem;
-		right: 1rem;
-		bottom: calc(.75rem + env(safe-area-inset-bottom, 0));
-		display: grid;
-		position: fixed;
-		grid-template-columns: 1fr 1fr;
+		width: 100%;
+		display: flex;
 	}
 }