body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    display: flex;
    flex-direction: column;
    height: 100vh; /* Garantit que le contenu occupe au moins la hauteur de l'écran */
}

header {
    height: 500px;
    background-color: #3dd0ac;
    display: flex;
    flex-direction: column;
    background-image: url(tree.png);
    background-repeat: no-repeat;
}

.titre {
    text-align: center;
    letter-spacing: 4px;
    font-size: 45px;
    color: white;
    font-size: xx-large;
    position: relative;
    top: 221px;
    margin: 0;
}

nav {
    width: 1000px;
    display: flex;
    align-self: center;
    justify-content: center;
    flex-grow: 1;
    margin: auto;
}

ul {
    list-style: none;
}

a {
    color: white;
    text-decoration: none;
    padding: 20px;
}

#actif {
    padding: 5px;
    background-color: white;
    color: #3dd0ac;
    border-radius: 5px;
    text-decoration: none;
}

a:hover {
    color: red;
    text-decoration: underline;
}

section {
    width: 760px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: auto;
    margin-bottom: 40px;
}

section h1 {
    text-align: center;
    letter-spacing: 4px;
    font-size: 45px;
    font-size: xx-large;
}
section p {
    text-align: justify;
    padding: 10px 0 10px 0;
}

footer {
    height: 40px;
    width: 100%;
    background-color: #3dd0ac;
    text-align: center;
    line-height: 40px;
    margin-top: auto; 
}

footer span {
    color: white;
}

#acces {
    display: block;
}

#contact p {
    line-height: 22px;
}

iframe {
    margin: 0px 70px 70px 70px;
}

img {
    margin: 20px;
    width: 375px;
    position: absolute;
}

#historique {
    height: 230px;
    background-color: #3dd0ac;
    display: flex;
    flex-direction: column;
    background-image: url(tree.png);
    background-repeat: no-repeat;
}

#historique .titre {
    text-align: center;
    letter-spacing: 4px;
    font-size: 45px;
    color: white;
    font-size: xx-large;
    position: relative;
    top: 10px;
}

#historique .nav {
    width: 800px;
    display: flex;
    align-self: center;
    justify-content: center;
    flex-grow: 1;
    margin: auto;
}   

#historique  img {
    margin: -176px;
    width: 375px;
    position: absolute;
}

#titre1 {
    text-align: center;
    color: grey;
}

#p1 {
    text-align: center;
    letter-spacing: 1px;
}

#footer {
    height: 40px;
    width: 100%;
    background-color: #3dd0ac;
    text-align: center;
    line-height: 40px;
    position: fixed;
    bottom: 0;
}

#historique footer span {
    color: white;
}

#plan {
    height: 230px;
    background-color: #3dd0ac;
    display: flex;
    flex-direction: column;
    background-image: url(tree.png);
    background-repeat: no-repeat;
}

#plan .titre {
    text-align: center;
    letter-spacing: 4px;
    font-size: 45px;
    color: white;
    font-size: xx-large;
    position: relative;
    top: 80px;
}

#plan .nav {
    width: 800px;
    display: flex;
    align-self: center;
    justify-content: center;
    flex-grow: 1;
    margin: auto;
}   

#plan  img {
    margin: -176px;
    width: 375px;
    position: absolute;
}

#section {
    position: fixed;
    top: 20px;
}

#acces {
    height: 230px;
    background-image: url(tree.png);
    background-repeat: no-repeat;
    height: 100%;
}

#acces .titre {
    text-align: center;
    letter-spacing: 4px;
    font-size: 45px;
    color: white;
    font-size: xx-large;
    position: relative;
    top: 80px;
}

#acces .nav {
    width: 800px;
    display: flex;
    align-self: center;
    justify-content: center;
    flex-grow: 1;
    margin: auto;
}   

#acces  img {
    margin: -176px;
    width: 375px;
    position: absolute;
}