feat: Update

src/components/Question.vue

@@ -52,8 +52,8 @@ function validatePopup() {
   ).checked = true;
   showHidePopup();
 }
-const h = ref(0);
-const d = ref(0);
+const h = ref();
+const d = ref();
 </script>
 
 <template>
@@ -136,8 +136,8 @@ const d = ref(0);
       <input v-model="h" type="number" name="H" />
       <label for="D">D (cm)</label>
       <input v-model="d" type="number" name="D" />
-      <p v-if="d != 0">≃ {{ Math.round((h * 100) / d) }}</p>
-      <p v-if="d == 0" class="no-visible"></p>
+      <p v-if="d && d != 0">≃ {{ Math.round((h * 100) / d) }}</p>
+      <p v-if="!d || d == 0" class="no-visible"></p>
       <button class="btn equal" @click="validatePopup">
         <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 36 36">
           <path