body{
    font-family: Arial;
    background:#f5f5f5;
    margin:0;
    padding:20px;
}

.container{
    max-width:500px;
    margin:auto;
    background:white;
    padding:20px;
    border-radius:10px;
}

.balance-box{
    text-align:center;
    margin-bottom:20px;
}

form{
    display:flex;
    flex-direction:column;
    gap:10px;
}

input,
select,
button{
    padding:10px;
}

button{
    background:#2ecc71;
    color:white;
    border:none;
    cursor:pointer;
}

button:hover{
    opacity:0.9;
}

li{
    display:flex;
    justify-content:space-between;
    padding:10px;
    border-bottom:1px solid #ddd;
}