* {
  border: 0;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  min-height: 100vh;
}

main {
  width: 100%;
}


html {
  --s: 300px;
  /* control the size*/
  --c1: #292929;
  --c2: #4e4f51;
  --c3: #3c3c3c;
  --c4: #181a1b;

  background: var(--c4);
}