CSS

how to make header always on top in html

#header {
	position: sticky; /*(recomended)*/
    top: 0px;
    position: fixed; 
}

how to make the header stay on the top of the page in html

header {
  position: sticky;
  top: 0;
}

html how to ensure that the header always on top

#header {
  position: fixed;
}

#content {
  margin-top: 100px;
}