body {
    font-family: Arial, sans-serif;
    background-color: #f4f6f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.caixa-principal {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    width: 500px;
    max-width: 90%;
    text-align: center;
}

.caixa-perguntas {
    font-size: 18px;
    margin-bottom: 20px;
}

.caixa-alternativas button {
    display: block;
    margin: 8px auto;
    padding: 10px 15px;
    border: none;
    border-radius: 8px;
    background-color: #0077ff;
    color: white;
    cursor: pointer;
    transition: background 0.3s;
}

.caixa-alternativas button:hover {
    background-color: #ff00f7;
}

.caixa-resultado {
    margin-top: 20px;
    font-weight: bold;
    color: #333;
}