body {
    background: #ffffff;
    font: normal 15pt Arial;
}
header {
    text-align: center;
    margin: 50px;
}

.painel {
    background: #50ad77;
    border-radius: 10px;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.322);
    margin: auto;
    padding: 15px;
    text-align: center;
    width: 650px;
}

.input {
    width: 100px;
    height: 20px;
}

.check-txt {
    font-size: 12pt;
}

.botao {
    width: 90px;
    height: 25px;
}

footer {
    text-align: center;
}

@media screen and (max-width: 400px) {
    body {
        margin: auto;
    }
    .painel {
        font-size: 1.8rem;
        width: auto;
        margin: 10px;
    }
}

@media screen and (max-width: 768px) {
    body {
        margin: auto;
    }
    .painel {
        font-size: 1.6rem;
        width: auto;
        margin: 10px;
    }
}