body {
    font-family: Arial;
    background: #111;
    color: #fff;
    text-align: center;
}

.container {
    padding: 20px;
}

.btn {
    background: red;
    color: white;
    padding: 15px;
    display: block;
    margin: 20px auto;
    text-decoration: none;
}

input, button {
    width: 90%;
    padding: 15px;
    margin: 10px;
    border-radius: 8px;
}

button {
    background: red;
    color: white;
    border: none;
}

/* Responsivo */
@media (min-width: 768px){
    .container {
        width: 500px;
        margin: auto;
    }
}