materio-d8/web/themes/custom/materiotheme/assets/styles/base/_layout.scss

body, html{
  position: relative;
  width: 100%;
  height:100%;
  font-family: sans-serif;
  font-style: normal;
  margin:0;
  padding:0;
}
body.toolbar-horizontal.toolbar-themes.toolbar-no-tabs{
  padding-top: 24px!important;
}