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

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #1a1a1a, #000);
    display: flex;
    justify-content: center;
    align-items: center;
}

main {
    background: white;
    padding: 40px;
    border-radius: 12px;
    width: 500px;
    max-width: 90%;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    text-align: center;
}

section {
    margin-bottom: 30px;
}

h1 {
    margin-bottom: 10px;
}

h2 {
    font-size: 16px;
    color: #555;
    margin-bottom: 20px;
}

code {
    font-family: inherit; 
    background-color: #f4f4f4;
    color: #000;
    padding: 2px 5px;
    border-radius: 4px;
}

.active-style {
    background: #111;
    color: white;
    padding: 20px;
    border-radius: 8px;
    transition: 0.3s ease;
}

.btnStyle {
    background: #111;
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    margin: 5px;
    transition: 0.2s ease;
}

.btnStyle:hover {
    background: #333;
}

.btn-group {
    display: flex;
    justify-content: center;
    gap: 10px;
}