body{
    font-family: Arial, sans-serif;
        background: #fca989;
}
.cotaner {
        display: flex;
        justify-content: center;
        align-items: center;
        height: 85vh;
        margin: 0;
    }
  
    .calculator {
        background: #fff;
        padding: 25px;
        border-radius: 15px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        width: 400px;
    }

    h1 {
        text-align: center;
        margin-bottom: 20px;
        font-size: 20px;
        color: #333;
    }

    input {
        width: 100%;
        padding: 12px;
        font-size: 18px;
        border-radius: 8px;
        border: 1px solid #ccc;
        margin-bottom: 15px;
        outline: none;
    }

    button {
        width: 100%;
        padding: 12px;
        font-size: 18px;
        border: none;
        background: #4CAF50;
        color: white;
        border-radius: 8px;
        cursor: pointer;
        transition: 0.3s;
    }

    button:hover {
        background: #45a049;
    }

    .result {
        margin-top: 15px;
        padding: 12px;
        border-radius: 8px;
        background: #f9f9f9;
        border: 1px solid #ddd;
        font-size: 18px;
        color: #1a1919;
    }

    .steps {
        margin-top: 10px;
        font-size: 14px;
        background: #eef6ff;
        padding: 10px;
        border-radius: 8px;
        border-left: 5px solid #007bff;
    }

    .history {
        margin-top: 20px;
        background: #f4f4f4;
        padding: 10px;
        border-radius: 10px;
        max-height: 120px;
        overflow-y: auto;
        font-size: 14px;
    }

    .error {
        color: red;
        font-weight: bold;
    }

    footer{
          text-align: center;
      font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
      background-color: #7ca8fa;
    }