styles.css

body {
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
    color: #343a40;
    margin: 0;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

form {
    margin-bottom: 20px;
    padding: 20px;
    background-color: #ffffff;
    border: 1px solid #ced4da;
    border-radius: 5px;
}

label {
    display: inline-block;
    width: 100px;
    margin-right: 10px;
}

input[type="text"], input[type="number"] {
    width: calc(100% - 120px);
    padding: 5px;
    margin-bottom: 10px;
}

input[type="submit"] {
    display: block;
    margin: 0 auto;
    padding: 10px 20px;
    background-color: #007bff;
    color: #ffffff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #0056b3;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table, th, td {
    border: 1px solid #ced4da;
}

th, td {
    padding: 10px;
    text-align: left;
}

th {
    background-color: #e9ecef;
}