* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
:root {
  --menu-speed: 0.75s;
}
body {
  font-family: "Roboto";
  line-height: 1.4;
}
header {
  background-color: blue;
  cover;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}