html {
    background: rgb(243, 243, 243);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 15pt;
  }
  
  html, body {
    height: 100%;
    margin: 0;
  }
  
  body {
    display: grid;
    place-items: center;
  }
  
  #converter {
    width: 15rem;
    padding: 2rem;
    border-radius: .5rem;
    box-shadow: 0 0 2rem 0 #0001;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  #converter input, #converter select {
    font-family: inherit;
    font-size: inherit;
    margin-block-end: 1rem;
    text-align: center;
    width: 10rem;
  }
  
  #converter #output-temp {
    font-size: 2rem;
    font-weight: bold;
  }