html {
  font-size: 16px;
}

section,
article,
aside,
div,
header,
footer,
main,
nav {
  box-sizing: border-box;
}

h1,
h2,
h3,
h4,
h5,
h6,
ul,
ol,
p,
blockquote {
  margin: auto;
  margin-block: auto;
}