:root {
  width: 100%;
  height: 100%;
  font-size: 16px;
  line-height: 1;
}

body,
div,
h1,
h2,
h3,
h4,
h5,
h6,
head,
html,
span {
  margin: 0;
  border: 0;
  padding: 0;
  box-sizing: border-box;
}

span {
  display: inline;
}

body,
div,
h1,
h2,
h3,
h4,
h5,
h6,
html {
  display: block;
}

head {
  display: none;
}