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

h1, h2, h3 {
    color: #333;
}

form {
    background: #fff;
    padding: 20px;
    margin: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

label {
    display: block;
    margin-bottom: 10px;
}

input[type="number"] {
    width: 100%;
    padding: 8px;
    margin: 5px 0 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}

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

#guthabenAnzeige li {
    padding: 10px;
    margin: 5px 0;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.guthaben-positiv {
    color: green;
    font-weight: bold;
}

.guthaben-negativ {
    color: red;
    font-weight: bold;
}

.guthaben-null {
    color: black;
    font-weight: bold;
}