body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #007bff;
    color: white;
    padding: 1rem;
    text-align: center;
}

main {
    padding: 1rem;
}

.input-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1rem;
}

.input-section label,
.input-section input,
.input-section select,
.input-section button {
    margin: 0.5rem 0;
}

.list-columns {
    display: flex;
    flex-direction: column; /* Ensures columns are stacked vertically */
    gap: 1rem;
}

.column {
    background-color: white;
    border: 1px solid #ddd;
    padding: 1rem;
    border-radius: 5px;
}

.column h2 {
    margin-top: 0;
    text-align: center;
}

.column ul {
    list-style-type: none;
    padding: 0;
}

.column ul li {
    background-color: #f9f9f9;
    margin: 0.5rem 0;
    padding: 0.5rem;
    border: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.column ul li button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 0.3rem 0.6rem;
    cursor: pointer;
}

.column ul li button:hover {
    background-color: #0056b3;
}