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              <div id="container">
	<h1>To-Do List <i class="fa fa-plus"></i></h1>
	<input type="text" placeholder="Add New Todo">
              /* https://uigradients.com/#Martini */
body {
  background: #FDFC47;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to right, #24FE41, #FDFC47);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to right, #24FE41, #FDFC47); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */

#container {
	width: 460px;
	margin: 100px auto;
	background: #f7f7f7;
	box-shadow: 0 0 3px rgba(0,0,0, 0.1);

h1 {
	background: #2980b9;
	color: white;
	margin: 0;
	padding: 10px 20px;
	text-transform: uppercase;
	font-size: 24px;
	font-weight: normal;

input {
	font-size: 18px;
	color: #2980b9;
	background-color: #f7f7f7;
	width: 100%;
	padding: 13px 13px 13px 20px;
	box-sizing: border-box;
	border: 3px solid rgba(0,0,0,0);

ul {
	list-style: none;
	margin: 0;
	padding: 0;

li {
	background: #fff;
	height: 40px;
	line-height: 40px;
	color: #666;

.fa-plus {
	float: right;

	background: #f7f7f7;

span {
	background: #e74c3c;
	height: 40px;
	margin-right: 20px;
	text-align: center;
	color: white;
	width: 0;
	display: inline-block;
	transition: 0.2s linear;
	opacity: 0;

li:hover span {
	width: 40px;
	opacity: 1.0;

	background: #fff;
	border: 3px solid #2980b9;
	outline: none;

.completed {
	color: gray;
	text-decoration: line-through;
              'use strict';

// ulを親要素に持つliに対してクラスをスイッチ
$("ul").on("click", "li", function(){

// ulを親要素に持つspan要素に対してコールバック
// iconをクリックした時に、親要素をfadeOut+elementを削除
$("ul").on("click", "span", function(event){

// Enterを押したときの要素の追加処理
	if(event.which === 13){
		var todoText = $(this).val();
    // 変数に格納した後はinputの中身は空にする
		$("ul").append("<li><span><i class='fa fa-trash'></i></span> " + todoText + "</li>")

// 入力欄切り替える処理

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