body {
    background-image: url(https://images.nintendolife.com/d5fc3c2675ad3/animal-crossing-wallpaper.original.jpg);
}
* {
    /* Typography */
    --main-font: 'Slabo 27px', serif;
    
    /* Calculation */
    --responsive: calc((var(--min-font) * 1px) + (var(--max-font) - var(--min-font)) * ((100vw - 420px) / (1200 - 420))); /* Ranges from 421px to 1199px */
  }
  
  h1 {
    /* Set max and min font sizes */
    --max-font: 50;
    --min-font: 25;
    font-family: var(--main-font);
    font-size: var(--responsive);

    border: 6px solid #000;
    border-radius: 10px;
    padding: 10px;
    background-color: antiquewhite;
  }
  
  p {
    font-family: sans-serif;
    margin: auto;
    width: fit-content;
    
    /* Set max and min font sizes */
    --max-font: 20;
    --min-font: 14;
    font-size: var(--responsive);
  }
  
  @media (min-width: 1200px) {
    h1,
    p {
      font-size: calc(var(--max-font) * 1px);
    }
  }
  
  @media (max-width: 420px) {
    h1,
    p {
      font-size: calc(var(--min-font) * 1px);
    }
  }
  
  
  
  
  
  
  
  /* Whatever */
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html, body {
    height: 100%;
  }
  
  body {
    display: flex;
  }
  
  div {
    margin: auto;
    padding: 20px;
  }
  
  a,
  a:visited,
  a:focus,
  a:active,
  a:link {
    text-decoration: none;
    outline: 0;
  }
  
  a {
    color: skyblue;
    transition: .2s ease-in-out color;
  }
  
  h1, h2, h3, h4 {
    margin: .3em 0;
  }
  
  ul {
    padding: 0;
    list-style: none;
  }
  
  img {
    vertical-align: middle;
    height: auto;
    width: 100%;
  }