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

body {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(to right, #c9d6ff, #e2e2e2);
    text-align: center;
}

.container {

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

}

h1 {

    font-size: 4vw;
    margin: 30px 0px;

}

form {

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

}

input {

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

}

button {

    display: inline-block;
    font-size: 15px;
    width: 120px;
    margin: 5px;
    padding: 3px;

}

.afficher {

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

}

.afficher ul {

    list-style: none;

}

.info-txt {

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

}