div#btn .btn-contact-blanc-to-bleu {
    background-color: transparent;
    padding: 8px 30px;
    border-radius: 10px;
    color: #0e4cef;
    cursor: pointer;
    font-size: 16px;
    width: auto;
    margin: 0 auto;
    white-space: nowrap;
    display: inline-block;
    border: 2px solid #0e4cef;
    font-weight: bold;
    box-shadow: 0px 1px 5px black;
    text-decoration: none;
}

div#btn a.btn-contact-blanc-to-bleu:hover { /**bien coller le hover sinon ca ne fonctionne pas**/
    background-color: #0e4cef;
    color: white;
    border: 2px solid #0e4cef;
    text-align: center;
}

div#btn {
    background-color: transparent;
}