body {
    background-color: #121212;
    color: #ffffff;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
}
h1 {
    text-align: center;
    color: #00e676;
}
.subject {
    background-color: #1e1e1e;
    margin: 10px 0;
    padding: 10px;
    border-radius: 8px;
}
.subject input {
    background-color: #2c2c2c;
    color: white;
    border: none;
    padding: 5px;
    width: 150px;
}
.subject button {
    margin-left: 5px;
    padding: 5px 10px;
    background-color: #00e676;
    color: black;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
.stats {
    margin-top: 10px;
}