html{
    margin: 0;
    padding: 0;
    text-align: center;
    height: 100%;
}

body{
    box-sizing: border-box;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(to bottom, deepskyblue, white);
}

ul#todolist{
    list-style-type: none;
    padding: 0;
    margin: auto;
    max-width: 400px;
}
ul#todolist li{
    text-align: left;
    border-bottom: 1px solid #ccc;
    padding: 20px;
    cursor: pointer;
    min-width: 250px;
    margin: auto;
}

ul#todolist li span.completed:after{
    content: "\1F5F9";
    color: green;
    font-size: 23px;
    padding: 4px;
}

ul#todolist li span.uncompleted:after{
    content: "\025A1";
    color: rgb(203, 59, 247);
    font-size: 40px;
    padding: 4px;
}

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

ul#todolist li:hover span.cross:after{
    content: "\02A2F";
    color: red;
    font-size: 40px;
    float: right;
    margin-right: 10px;
}