.calculator-container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    font-family: Arial, sans-serif;
}
.calculator-container fieldset {
    border: 1px solid #ccc;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 5px;
    background: #fff;
}
.calculator-container legend {
    font-size: 1.2em;
    background: #008C95;
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
}
.calculator-container form {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}
.calculator-container .input-group {
    width: 100%;
    margin: 10px 0;
    display: flex;
    align-items: center;
}
.calculator-container .input-group label {
    width: 120px;
    font-weight: bold;
    margin-right: 10px;
}
.calculator-container .input-group input[type="text"] {
    padding: 5px;
    font-size: 16px;
    width: 150px;
    border: 1px solid #ccc;
    border-radius: 3px;
}
.calculator-container .input-group button {
    padding: 8px 16px;
    background: #008C95;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}
.calculator-container .input-group button:hover {
    background: #00787a;
}