.logo {
  text-align: center;
}

.logo img {
  display: none !important;
}

.logo a::before {
  content: '';
  display: inline-block;
  width: 150px;
  height: 40px;
  background-image: url('https://www.eskemm-numerique.fr/wp-content/themes/eskemm/images/logo_footer.png');
  background-size: contain;
  background-repeat: no-repeat;
  vertical-align: middle;
}