body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    background-color: #333;
    color: white;
    padding: 10px 20px;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav ul {
    padding: 0;
    list-style: none;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

section {
    margin: 20px;
    padding: 20px;
    border-bottom: 1px solid #ccc;
}

#question {
    margin-bottom: 20px;
}

#answers li {
    list-style: none;
    margin: 5px 0;
}

button {
    margin-top: 20px;
    padding: 10px;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 20px;
    position: relative;
    bottom: 0;
    width: 100%;
}

#timer {
    font-size: 24px;
    color: #fff;
    background-color: #333;
    padding: 10px;
    border-radius: 5px;
    display: inline-block;
    margin: 10px 0;
}

#quiz-container {
    text-align: center;
}

#answers li button {
    padding: 10px;
    margin: 5px;
    background-color: #f4f4f4;
    border: 1px solid #ddd;
    cursor: pointer;
}

#answers li button:hover {
    background-color: #e9e9e9;
}

#answers li button:disabled {
    background-color: #ddd;
}

.alert {
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: 4px;
}

.alert-success {
    color: #3c763d;
    background-color: #dff0d8;
    border-color: #d6e9c6;
}

.alert-warning {
    color: #8a6d3b;
    background-color: #fcf8e3;
    border-color: #faebcc;
}