#principal{
overflow: auto;
background:white;
margin:10px 0 20px 0;
border:1px solid gray;
position:relative;
}
#bandeau{
min-height: 35px;
padding:5px 0 0 107px;
background:#503b9d;
position:relative;
}
H1.titre_parcours {
    font-size: 3rem;
    color: black;
}
.publiepar{
color: black;
}
.cartouche_jaune {
    display: inline-block;
    text-decoration: none;
    background: #fcc200;
    color: #4222a1;
    padding: 5px;
    margin: 6px;
    border-radius: 6px;
    -moz-border-radius: 6px;
    -webkit-border-radius: 6px;
}

.introduction {
    font-size: 1.1rem;
    color: black;
    padding: 0;
}

.boutonentrer {
    display: inline-block;
    border: 1px solid red;
    color: red;
    padding: 13px 20px;
    font-size: 1.5rem;
    margin: 30px auto;
    text-decoration: none;
}
.barre_bas{
position:fixed;
background:white;
min-width: 440px;
bottom:0;
width: 100%;
text-align:center;
border-bottom:1px solid #C0C0C0;
}