html,
body {
    background: #fff;
    font-family: -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
    margin: 0;
    width: 100%;
    color: #333;
    text-align: center;
}

a {
    text-decoration: none;
    color: inherit;
    transition-duration: .1s;
}

a:hover {
    opacity: .8;
    transition-duration: .1s;
}

ul, li {
    list-style-type: none;
    line-height: 1.5em;
    padding: 0;
}

header,
footer {
    width: 80%;
    max-width: 1280px;
    margin: 50px auto;
}

header div#topheader {
    background: #03036b;
    text-align: left;
    position: fixed;
    z-index: 5;
    top: 0;
    right: 0;
    margin: 0;
    padding: 10px 20px;
    width:100%; height:90px;

}

header div#topheader img {
    height:70px;
    background: #fff;
    margin:0 25px;
}

header div#topheader a {
    color:#fff;
    margin:0 25px;
    clear: both;
}



header p,
footer p {
    font-size: 14px;
    color: #808080;
    margin: 20px 0;
}

footer {
    margin-top: 80px;
}

li a, footer p:first-of-type a {
    text-decoration: underline;
}

section {
    font-size: 21px;
    margin: 70px auto;
    max-width: 800px;
}

section h1 {
    font-family: 'Montserrat',sans-serif;
    text-transform: uppercase;
    color: #1A3771;
    font-weight: 700;
    margin: 0 auto;
    max-width: 600px;
    letter-spacing: 2px
}

section h2{
    font-family: 'Montserrat',sans-serif;
    text-transform: uppercase;
    color: #1A3771;
    font-weight: 700;
    margin: 20px auto;
    line-height: 24px;
    max-width: 600px;
    text-align: left;
    font-size: 1.2em;
}

section h3{
    font-size: 0.9em;
    margin: 0 auto 0 auto;
    max-width: 700px;
    line-height: 24px;
     text-align: center;
}

section p {
    font-size: 0.6em;
    margin: 30px auto;
    max-width: 700px;
    padding:0.2em;
    text-align: justify;
}


section img.premiervisu {
    margin: 30px 0;
    max-width: 600px;
}
section img.visu {
    max-width: 600px;
}

.action-bouton-gauche {
    width: 40%; padding: 20px;
    border:1px solid #ccc;
    float: left;
    display: block;
}

.action-bouton-droite {
    width: 40%; padding: 20px;
    border:1px solid #ccc;
    float: right;
    display: block;
}

@media screen and (min-width: 1921px) {
    
    section .banniere img {
        border-radius: 10px;
    }
}

@media screen and (max-width: 479px) {

    .action-bouton-gauche {
    width: 300px;
    border:1px solid #ccc;
    float: left;
    display: block;
}

.action-bouton-droite {
    width: 300px;
    border:1px solid #ccc;
    float: left;
    display: block;
}

    section img.premiervisu {
    margin: 30px 0;
    max-width: 100%;
}
section img.visu {
    max-width: 100%;
}

    section .liens a {
        margin-bottom: 10px;
        font-size:10px;
    }
    
    footer {
        margin: 0 auto;
    }
}