* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
  }
  
  body {
    min-height: 100vh;
    background-color: #1b1b32;
    padding: 50px 20px;
    font-family: 'Lato', Helvetica, Arial, sans-serif;
    font-size: 18px;
    color: #f5f6f7;
  }
  
  main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  
  .freeCodeCamp-logo {
    height: 30px;
    margin-bottom: 20px;
  }
  
  h1 {
    text-align: center;
    margin: 20px auto;
    max-width: 350px;
    font-family: 'Castoro Titling', cursive;
  }
  
  form { 
    padding: 25px;
    color: #f5f6f7;
    margin: auto 25px;
    border: 3px solid #f5f6f7;
    text-align: center;
    width: 90%;
    max-width: 500px;
    background-color: #3b3b4f;
  }
  
  fieldset {
    border: 0 none;
    height: 100%;
    padding: 25px;
    margin: 10px 20px;
  }
  
  legend {
    display: inline-block;
    font-size: 1.5rem;
    margin-bottom: 10px;
    font-weight: bold;
  }
  
  input {
    background-color: black;
    border: 1px solid #f5f6f7;
    display: block;
    font-size: 2.5rem;
    width: 100%;
    text-align: center;
    height: 60px;
    padding: 6px 12px; 
    margin: 10px 0;
    line-height: 1.4;
    color: #f5f6f7;
  }
  
  input[type=number]::-webkit-outer-spin-button,
  input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
  }
  
  fieldset > button {
    height: 60px;
    text-decoration: none;
    padding: 10px 16px;
    font-size: 2rem;
    margin-top: 20px;
    cursor: pointer;
    background-image: linear-gradient(#fecc4d, #ffac33);
    border: 3px solid #feac32;
    width: 100%;
  }
  
  .output {
    padding: 20px;
    height: 100%;
    text-align: center;
    width: 90%;
    max-width: 500px;
    margin: 5vh;
    border: 3px solid #f5f6f7;
    background-color: #3b3b4f;
    font-size: 2.5rem;
  }
  
  .hidden {
    display: none;
  }