.inner {
    text-align: center;
}

.btn {
    display: inline-block;
    border-radius: 8px;
    background-color: darkgoldenrod;
    padding: 8px;
    color: aliceblue;
    text-decoration: none;
}

.btn:hover {
    text-decoration: underline;
}

.formulaire {
    display: inline-block;
}

.inner h1 a {
    text-decoration: none;
    color: black;
}