input[type="range"] {
    width: 60%;
  }

  .sigma-display {
    font-size: 1.2rem;
    margin-bottom: 1rem;
  }

  table {
    margin: 1rem auto;
    border-collapse: collapse;
  }

  td {
    padding: 8px;
    width: 40px;
    height: 40px;
    border: 1px solid #ccc;
    background: #fff;
    font-weight: bold;
  }

  td.positive {
    background-color: #e0f7fa;
    color: #00796b;
  }

  td.negative {
    background-color: #ffebee;
    color: #c62828;
  }

  td.zero {
    background-color: #eceff1;
    color: #546e7a;
  }

  .info {
    font-size: 0.9rem;
    color: #666;
    margin-top: 1rem;
    /* color: #ecd48b; */
  }