*, ::before, ::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: #333;
    color: #f1f1f1;
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}

.container {

    width: 70%;
    max-width: 1100px;
    margin: 0px auto;

}

h1 {

    font-size: 5vw;
    margin: 70px 0px;

}

form {

    position: relative;
    width: 100%;
    display: flex;
    justify-content: start;
    align-items: center;
    flex-wrap: wrap

}

label {

    position: absolute;
    top: -40px;
    font-size: 20px;

}

input {

    display: block;
    font-size: 20px;
    width: 100%;
    padding: 10px;
    outline: none;
    border: none;
    margin-bottom: 15px;

}

button {

    display: inline-block;
    font-size: 20px;
    padding: 3px;

}

.afficher {

    font-size: 20px;
    width: 75%;
    margin: 5px auto;
    padding: 5px;

}

.afficher ul {

    list-style: none;

}

li {

    font-size: 20px;
    width: 100%;
    background-color: #f1f1f1;
    color: #333;
    display: flex;
    align-items: center;
    padding: 5px;
    margin: 5px 0px;

}

li input {

    width: 40px;
    height: 40px;
    margin-left: 15px;

}

li button {

    margin-left: auto;
    padding: 5px;

}

button img {

    width: 40px;
    pointer-events: none;

}

li span {

    font-size: 25px;
    width: 100%;
    text-align: start;
    margin-left: 20px;

}

li.finDeTache span {

    text-decoration: line-through;

}