html,
body {
  margin: 0;
  padding: 0;
   overflow-x: hidden; /* évite le scroll horizontal inutile */
   scroll-behavior: smooth;
}


h1,
h2,
h3,
h4,
h5 {
  margin: 0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

a {
  text-decoration: none;
  color: inherit;
}