body {
    font-family: Arial, sans-serif;
    margin: 0;
    justify-content: center;
    padding: 0;
    background-color: #f4f4f4;
    text-align: center;
}
header {
    background: #333;
    justify-content: center;
    color: white;
    text-align: center;
    padding: 10px;
}
nav ul {
    list-style: none;
    justify-content: center;
    padding: 0;
    text-align: center;
}
nav ul li {
    display: inline;
    justify-content: center;
    margin: 10px;
    text-align: center;
}
nav ul li a {
    text-decoration: none;
    color: black;
    font-weight: bold;
    justify-content: center;
    text-align: center;
}
.hesap-listesi {
    display: grid;
    justify-content: center;
    gap: 20px;
    padding: 20px;
    text-align: center;
}
.hesap {
    background: white;
    padding: 10px;
    justify-content: center;
    border-radius: 5px;
    text-align: center;
    width: 200px;
}