body {
    font-family: 'Arial', 'Helvetica', sans-serif;
    background-color: #121212;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    
    flex-direction: column;
    
}

.container {
    text-align: center;
}

.subjects {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 2em;
}

.subject-btn {
    display: flex;
    align-items: center;
    padding: 1em;
    margin: 0.5em;
    background-color: #1e1e1e;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    width: 80%;
    max-width: 400px;
    text-decoration: none;
}

.subject-btn img {
    margin-right: 1em;
    width: 30px;
    height: 30px;
}

.subject-btn:hover {
    background-color: #333;
}

.hidden {
    display: none;
}

.btn-container {
    margin-top: 1em;
}

button {
    padding: 0.5em 1em;
    margin: 0.5em;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}
.credit-section {
    
    
    font-size: 1.5em;
    font-weight: bold;
}

.quiz-container {
    background-color: #1e1e1e;
    padding: 2em;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 600px;
    margin: 0px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.quiz-container h1 {
    margin-bottom: 1em;
    color: #4CAF50;
}


.options {
    list-style: none;
    padding: 0;
    margin: 1em 0;
}

.options li {
    margin: 0.5em 0;
    background-color: #3a3a3a;
    padding: 0.7em;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.options li:hover {
    background-color: #45a049;
}

.options li input {
    margin-right: 0.5em;
}

.submit-btn {
    padding: 0.7em 2em;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 1em;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #45a049;
}

.submit-btn:focus {
    outline: none;
}

.quiz-footer {
    margin-top: 2em;
    display: flex;
    justify-content: space-between;
    width: 100%;
}

.quiz-footer button {
    padding: 0.7em 2em;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

.quiz-footer button:focus {
    outline: none;
}

#score {
    margin-top: 1em;
    font-size: 1.2em;
    color: #4CAF50;
}