img.insta-menu:hover {
src: url("https://duplex-danse.ch/wp-content/uploads/2018/05/insta.png");
}

img.fb-menu:hover {
src: url("https://duplex-danse.ch/wp-content/uploads/2018/05/fb.png");
}

img.mail-menu:hover {
src: url("https://duplex-danse.ch/wp-content/uploads/2018/05/mail.png");
}