body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    padding-top: 50px;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    width: 350px;
    text-align: center;
}

.balance-card {
    background: #2ecc71;
    color: white;
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 20px;
}

input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-sizing: border-box;
}

.buttons {
    display: flex;
    gap: 10px;
}

button {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    color: white;
    font-weight: bold;
}

.btn-deposit { background-color: #27ae60; }
.btn-withdraw { background-color: #e74c3c; }

ul {
    list-style: none;
    padding: 0;
    text-align: left;
    max-height: 200px;
    overflow-y: auto;
}

li {
    padding: 8px;
    border-bottom: 1px solid #eee;
    font-size: 0.9rem;
}