* {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  margin: 0;
  padding: 0;
  letter-spacing: 0;
}
html,
body,
nav {
  position: relative;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
}
main {
  max-width: 100%;
  width: 100%;
}
a {
  text-decoration: none;
}
ul {
  list-style: none;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: normal;
}