body {

    font-family: Arial, sans-serif;

    margin: 0;

    padding: 0;

    background-color: #f4f4f4;

}


header {

    background: #333;

    color: #fff;

    padding: 10px 0;

    text-align: center;

}


nav ul {

    list-style: none;

    padding: 0;

}


nav ul li {

    display: inline;

    margin: 0 15px;

}


nav ul li a {

    color: #fff;

    text-decoration: none;

}


main {

    padding: 20px;

}


.sales-container {

    display: flex;

    flex-direction: column;

}


.row {

    display: flex;

    justify-content: space-between;

    margin: 10px 0;

}


.column {

    background: #fff;

    border: 1px solid #ccc;

    padding: 20px;

    flex: 0 0 48%; /* Each column takes up 48% of the row */

    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);