body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background-color: #fff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    width: 300px;
    text-align: center;
}

h1 {
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

input[type="text"], input[type="number"] {
    width: calc(100% - 22px);
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 10px 20px;
    background-color: #28a745;
    border: none;
    color: white;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #218838;
}

.expenses {
    text-align: left;
}

.expenses h2 {
    margin-top: 0;
}

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

li {
    background-color: #f9f9f9;
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
}