body {
  font-family: 'Calibri', Arial, sans-serif;
}

#mainNav::before{
	content:'';
    background-image: url(https://s3.unistra.fr/immersup-montaigne-prod/prod/2025/ubm-logosolo-zs-n.png?AWSAccessKeyId=OPFTP7PNQ6VH2XTF7P4K&Signature=tOkPMeB%2B5VOvppt2A6Cxbqp%2BU8Q%3D&Expires=2738925025) !important;
    background-position: left center; 
    background-repeat: no-repeat;
	background-size: contain;	
    width: 240px;
    height: 70px;
	display: block;
}