.calculator {
    background-color: #f7ebd8;
    border: 2px solid #333;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    width: 90%;
    max-width: 400px;
  }
  h1 {
    text-align: left;
    margin-bottom: 20px;
    font-size: 1.8em;
  }
  h2 {
    text-align: left;
    margin-top: 5px;
    margin-bottom: 5px;
    font-size: 1.2em;
  }
  .input-group {
    margin-bottom: 15px;
  }
  .input-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 1em;
  }
  .input-group input {
    width: 100%;
    height: 40px;
    font-size: 1.1em;
    padding: 5px;
    box-sizing: border-box;
  }
  #berechnen {
    width: 100%;
    height: 45px;
    font-size: 1.1em;
    margin-top: 10px;
    cursor: pointer;
  }
  #ergebnis-container {
    margin-top: 15px;
  }
  #ergebnis-container label {
    font-size: 1em;
    display: block;
    margin-bottom: 5px;
  }
  #ergebnis-container input {
    width: 100%;
    height: 40px;
    font-size: 1.1em;
    padding: 5px;
    background-color: lightyellow;
    font-weight: bold;
    box-sizing: border-box;
  }