app.css

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

.heros,
.apropos,
.services,
.contact {
    max-width: 1000px;
    margin: 0 auto;
    margin-bottom: 20px;
}

.en-tete {
    padding: 0 70px;
    display: flex;
    align-content: center;
    justify-content: space-between;
    margin-top: 20px;
    margin-bottom: 20px;
}

.nav {
    display: flex;
    align-content: center;
    justify-content: center;
    gap: 60px;
    list-style-type: none;
}

.nav li a {
    text-decoration: none;
    color: black;
    font-size: 1.2rem;
}


.heros {
    background-color: #eee;
    height: 200px;
}

.heros h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 6;
}

.apropos {
    background-color: #eee;
    height: 200px;
}

.apropos h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 6;
}

.services {
    background-color: #eee;
    height: 200px;
}

.services h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 6;
}

.contact {
    background-color: #eee;
    height: 200px;
}

div a:hover
{
    background: darkred;
    border-radius: 15px;
    width: 400px;
    height: 250px;
}

.contact h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 6;
}

.pied-de-page {
    background-color: #777;
    height: 40px;
}

.pied-de-page p {
    margin-left: 50%;
    line-height: 1.7;
}