* {
  position: relative;
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 0;
  font-size: 1.6em;
  overflow-x: hidden;
  font-family: Kanit, sans-serif;
  background: dodgerblue;
}

.fullscreen {
  width: 100vw;
  height: 100vh;
  padding: 5vw;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 8vw;
  color: white;
}

.nav {
  top: 0;
  width: 100vw;
  padding: 20px;
  position: fixed;
  background: #00bfff;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  height: 100px;
}

a {
  margin-right: 20px;
  text-decoration: none;
  color: black;
  display: inline-block;
  font-size: clamp(14px, 3vw, 30px);
}