display flex:1 for <input> 固定框大小 (chrome 58 bug)

src/features/OnlineExam/Examing/MultipleQuestionView.vue

@@ -252,6 +252,7 @@ export default {
 
 .question-options {
   text-align: left;
+  flex: 1;
 }
 
 .question-options > .question-body {

src/features/OnlineExam/Examing/SingleQuestionView.vue

@@ -223,6 +223,10 @@ export default {
   border-radius: 5px;
 }
 
+.question-options {
+  flex: 1;
+}
+
 .option:hover {
   background-color: aliceblue;
 }