diff --git a/src/App.vue b/src/App.vue
index f28860a..67c0c9e 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,195 +1,229 @@
 <script>
-  /*
-  * Specification of item data structure:
-  * {
-  *  type: string, // 'text', 'radio', 'checkbox', 'scale'
-  *  title: string,
-  *  optTexts: string[], // only for 'radio', 'checkbox', 'scale'
-  *  optValues: string[], // only for 'radio', 'checkbox', 'scale'
-  *  required: boolean, // optional, whether the user must answer the question, default is true
-  *  answer: string, // user's answer, appended after user submits
-  *  refilled: boolean, // whether the user refilled the answer, appended after user submits
-  * }
-  */
-  const ITEM_TYPES = ['text', 'radio', 'checkbox', 'scale'];
-  function isValidItem({type, title, optTexts, optValues = null}) {
-    if (!title || !ITEM_TYPES.includes(type)) {
-      return false;
-    }
-    if (type === "text") {
-      return true;
-    }
-    if (optTexts && optValues && optTexts.length !== optValues.length) {
-      return false;
-    }
+/*
+* Specification of item data structure:
+* {
+*  type: string, // 'text', 'radio', 'checkbox', 'scale'
+*  title: string,
+*  optTexts: string[], // only for 'radio', 'checkbox', 'scale'
+*  optValues: string[], // only for 'radio', 'checkbox', 'scale'
+*  required: boolean, // optional, whether the user must answer the question, default is true
+*  answer: string, // user's answer, appended after user submits
+*  refilled: boolean, // whether the user refilled the answer, appended after user submits
+* }
+*/
+const ITEM_TYPES = ['text', 'radio', 'checkbox', 'scale'];
+function isValidItem({ type, title, optTexts, optValues = null }) {
+  if (!title || !ITEM_TYPES.includes(type)) {
+    return false;
+  }
+  if (type === "text") {
     return true;
   }
-  
-  export default {
-    data() {
-      return {
-        title: undefined,
-        items: [],
-        currentTitle: undefined,
-        currentIdx: undefined,
-        currentItem: undefined,
-        currentAnswer: undefined,
-        currentAnswerValue: undefined,
-        currentRefilled: false,
-        timestamp: undefined,
-        uiStatus: {
-          backButtonDisabled: true,
-          nextButtonText: 'Next',
-          nextButtonStatus: 'primary',
-        },
-        settings: {
-          allowBack: true,
-        },
-      }
-    },
-    created() {
-      window.addEventListener('message', (event) => {
-        const data = event.data;
-        if (event.source === window.parent && data && data.type === 'spec') {
-          this.settings = Object.assign(this.settings, data.settings);
-          this.items = structuredClone(data.items);
-          this.title = data.title;
-          if (!this.items.every(item => isValidItem(item))) {
-            throw new Error('Invalid item');
-          }
-          
-          this.currentIdx = 0;
-          this.updateItem();
-        }
-      });
-    },
-    computed: {
-      isReady() {
-        return this.items && this.title;
-      },
-    },
-    methods: {
-      updateBackButton() {
-        this.uiStatus.backButtonDisabled = !this.settings.allowBack || (this.currentIdx === 0);
-      },
-      updateNextButton() {
-        if (this.currentIdx === this.items.length - 1) {
-          this.uiStatus.nextButtonText = 'Submit';
-          this.uiStatus.nextButtonStatus = 'success';
-        } else {
-          this.uiStatus.nextButtonText = 'Next';
-          this.uiStatus.nextButtonStatus = 'primary';
-        }
-      },
-      updateTitle() {
-        this.currentTitle = this.currentItem ?
-          `${this.currentIdx + 1}. ${this.currentItem.title}` : '';
-      },
-      updateItem() {
-        this.currentItem = this.items[this.currentIdx];
-        this.currentAnswer = this.items[this.currentIdx].answer;
-        this.currentRefilled = (this.currentItem.answer !== undefined);
-        this.timestamp = new Date().getTime();
-        this.updateTitle();
-        this.updateBackButton();
-        this.updateNextButton();
-      },
-      iterOptions() {
-        return this.currentItem.optTexts.map((optText, index) => [
-          optText,
-          this.currentItem.optValues ? this.currentItem.optValues[index] : optText,
-        ]);
-      },
-      clickNext() {
-        const item = this.items[this.currentIdx];
-        item.answer = this.currentAnswer;
-        item.refilled = this.currentRefilled;
-        item.responseTime = new Date().getTime() - this.timestamp;
+  if (optTexts && optValues && optTexts.length !== optValues.length) {
+    return false;
+  }
+  return true;
+}
 
-        if (this.currentIdx === this.items.length - 1) {
-          this.submit();
-        } else {
-          this.currentIdx++;
-          this.updateItem();
-        }
+export default {
+  data() {
+    return {
+      title: undefined,
+      started: undefined,
+      items: [],
+      currentTitle: undefined,
+      currentIdx: undefined,
+      currentItem: undefined,
+      currentAnswer: undefined,
+      currentAnswerValue: undefined,
+      currentRefilled: false,
+      timestamp: undefined,
+      uiStatus: {
+        backButtonDisabled: true,
+        nextButtonText: 'Next',
+        nextButtonStatus: 'primary',
       },
-      autoNext() {
-        if (this.currentIdx < this.items.length - 1) {
-          this.clickNext();
-        }
+      settings: {
+        allowBack: true,
       },
-      clickBack() {
-        if (this.currentIdx > 0) {
-          this.currentIdx--;
-          this.updateItem();
+    }
+  },
+  created() {
+    window.addEventListener('message', (event) => {
+      const data = event.data;
+      if (event.source === window.parent && data && data.type === 'spec') {
+        this.settings = Object.assign(this.settings, data.settings);
+        this.items = structuredClone(data.items);
+        this.title = data.title;
+        if (!this.items.every(item => isValidItem(item))) {
+          throw new Error('Invalid item');
         }
-      },
-      submit() {
-        const results = this.items.map((item, index) => ({
-          index: index,
-          title: item.title,
-          answer: item.answer || '',
-          refilled: item.refilled,
-          responseTime: item.responseTime,
-        }));
-        window.parent.postMessage({ type: 'response', results }, window.origin);
-        const elem = document.createElement('a');
-        elem.href = 'data:text/json;charset=utf-8,' + encodeURIComponent(JSON.stringify(results));
-        elem.download = 'results.json';
-        elem.click();
+
+        this.currentIdx = 0;
+        this.updateItem();
+        this.started = new Date().getTime();
       }
+    });
+  },
+  computed: {
+    isReady() {
+      return this.items && this.title;
+    },
+  },
+  methods: {
+    updateBackButton() {
+      this.uiStatus.backButtonDisabled = !this.settings.allowBack || (this.currentIdx === 0);
+    },
+    updateNextButton() {
+      if (this.currentIdx === this.items.length - 1) {
+        this.uiStatus.nextButtonText = 'Submit';
+        this.uiStatus.nextButtonStatus = 'success';
+      } else {
+        this.uiStatus.nextButtonText = 'Next';
+        this.uiStatus.nextButtonStatus = 'primary';
+      }
+    },
+    updateTitle() {
+      this.currentTitle = this.currentItem ?
+        `${this.currentIdx + 1}. ${this.currentItem.title}` : '';
+    },
+    updateItem() {
+      this.currentItem = this.items[this.currentIdx];
+      this.currentAnswer = this.items[this.currentIdx].answer;
+      this.currentRefilled = (this.currentItem.answer !== undefined);
+      this.timestamp = new Date().getTime();
+      this.updateTitle();
+      this.updateBackButton();
+      this.updateNextButton();
+    },
+    iterOptions() {
+      return this.currentItem.optTexts.map((optText, index) => [
+        index,
+        optText,
+      ]);
+    },
+    clickNext() {
+      const item = this.items[this.currentIdx];
+      item.answer = this.currentAnswer;
+      item.refilled = this.currentRefilled;
+      item.responseTime = new Date().getTime() - this.timestamp;
+
+      if (this.currentIdx === this.items.length - 1) {
+        this.submit();
+      } else {
+        this.currentIdx++;
+        this.updateItem();
+      }
+    },
+    autoNext() {
+      if (this.currentIdx < this.items.length - 1) {
+        this.clickNext();
+      }
+    },
+    clickBack() {
+      if (this.currentIdx > 0) {
+        this.currentIdx--;
+        this.updateItem();
+      }
+    },
+    submit() {
+      const results = this.items.map((item, index) => ({
+        index: index,
+        title: item.title,
+        answer: item.answer || '',
+        refilled: item.refilled,
+        responseTime: item.responseTime,
+      }));
+      window.parent.postMessage({
+        type: 'response',
+        started: this.started,
+        ended: new Date().getTime(),
+        results
+      }, window.origin);
+      const elem = document.createElement('a');
+      elem.href = 'data:text/json;charset=utf-8,' + encodeURIComponent(JSON.stringify(results));
+      elem.download = 'results.json';
+      elem.click();
     }
   }
+}
 </script>
 
 <template>
   <div v-if="!isReady">Loading...</div>
-  <div id="container" v-if="isReady">
-    <span id="display-title">{{ currentTitle }}</span>
-    <div id="display-content">
+  <el-container id="main" v-if="isReady">
+    <el-header height=22pt id="display-title">{{ currentTitle }}</el-header>
+    <el-container id="display-desc" v-if="true">
+      <el-text class="mx-1" size="large">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor
+        incididunt ut
+        labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
+        aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu
+        fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit
+        anim id est laborum.</el-text>
+    </el-container>
+    <el-main id="display-content">
       <template v-if="currentItem.type === 'text'">
-        <el-input v-model="currentAnswer" style="width: 240px" placeholder="Please input" />
+        <el-input v-model="currentAnswer" autosize placeholder="Please input" />
       </template>
       <template v-else-if="currentItem.type === 'radio'">
-        <div>
-          <el-radio-group
-            v-model="currentAnswer"
-            v-for="[optText, optValue] in iterOptions()"
-            :key="optValue"
-            @change="autoNext"
-          >
-            <el-radio-button :label="optText" :value="optValue" />
-          </el-radio-group>
-        </div>
+        <el-radio-group v-model="currentAnswer" v-for="[index, optText] in iterOptions()" :key="index"
+          @change="autoNext">
+          <el-radio-button :label="optText" :value="index" />
+        </el-radio-group>
       </template>
-    </div>
-    <div id="display-buttons">
+    </el-main>
+    <el-footer id="display-buttons">
       <el-button-group>
-        <el-button type="primary" round :disabled="uiStatus.backButtonDisabled" @click="clickBack">
-          <el-icon class="el-icon--left"><ArrowLeft /></el-icon>Back
+        <el-button type="info" round :disabled="uiStatus.backButtonDisabled" @click="clickBack">
+          <el-icon class="el-icon--left">
+            <ArrowLeft />
+          </el-icon>Back
         </el-button>
         <el-button :type="uiStatus.nextButtonStatus" round @click="clickNext">
-          {{ uiStatus.nextButtonText }}<el-icon class="el-icon--right"><ArrowRight /></el-icon>
+          {{ uiStatus.nextButtonText }}<el-icon class="el-icon--right">
+            <ArrowRight />
+          </el-icon>
         </el-button>
       </el-button-group>
-    </div>
-  </div>
+    </el-footer>
+  </el-container>
 </template>
 
 <style scoped>
-  #container {
-    text-align: left;
-    width: 100%;
-  }
-  #display-title {
-    font-size: 20px;
-    font-weight: bold;
-  }
-  #display-content {
-    margin-top: 1ex;
-    margin-bottom: 2ex;
-  }
-  #display-buttons {
-    text-align: center;
-  }
+#main {
+  width: 50%;
+  background-color: #FAFCFF;
+  margin: 10% 25%;
+  padding-top: 4ex;
+  padding-left: 2ex;
+  padding-right: 2ex;
+  border-radius: var(--el-border-radius-round);
+  box-shadow: var(--el-box-shadow-dark);
+  font-family: var(--el-font-family);
+}
+
+#display-title {
+  text-align: left;
+  font-size: 18pt;
+  font-weight: bold;
+  color: rgb(51.2, 126.4, 204);
+}
+
+#display-desc {
+  width: 90%;
+  margin: 1ex auto;
+}
+
+#display-buttons {
+  text-align: center;
+}
+
+#display-content {
+  padding-top: 1ex;
+}
+
+#display-content el-input {
+  width: 100%;
+  font-size: 16pt;
+}
 </style>
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