body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}
.container {
    width: 50%;
    margin: auto;
    background: #fff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin-top: 50px;
}
h1, h2 {
    text-align: center;
}
form {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}
input, select, button {
    padding: 10px;
    font-size: 1em;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}
th, td {
    padding: 10px;
    border: 1px solid #ddd;
    text-align: center;
}
#expense-summary {
    margin-top: 20px;
    text-align: center;
}