todolist.css

#container{
	width: 360px;
	margin:100px auto;
	background-color: white;
}
h1{
	margin: 0 0;
	color: white;
	background-color: rgb(12, 104, 140);
	padding:20px 10px;
	font-size: 24px;
}

ul{
	width: 360px;
	margin:0 0;
	list-style: none;
	padding-left: 0;
}

body{
	background: linear-gradient(to right,rgb(12, 159, 216),white);
}

.selected{
	color: gray;
	text-decoration: line-through;
}

input{
	display: none;
	box-sizing: border-box;
	height: 40px;
	font-size: 18px;
	width: 100%;
	color: rgb(12, 104, 140);
	border:3px solid rgba(0,0,0,0); 
}

input:focus{
	outline: none;
	border:3px solid rgb(12, 104, 140);
}


li{ 
	height: 40px;
	line-height: 40px;
	font-size: 18px;
	color: #666;
}

li:nth-of-type(2n){
	background-color: rgb(178, 178, 168);

}

.fa-plus{
	float: right;
	}

span{
	color:white;
	background-color: rgb(223, 5, 9);
	display: inline-block;
	margin-right:20px;
	text-align: center;
	width:0;
	opacity: 0; 
	transition: linear 0.2s;
}

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