* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f2f2f2;
}

/* MENU SUPERIOR */
.menu {
    background: #111;
    padding: 15px;
    text-align: center;
}

.menu a {
    color: #fff;
    margin: 0 12px;
    text-decoration: none;
    font-weight: bold;
}

.menu a:hover {
    color: #00ff88;
}

/* CONTEÚDO */
.container {
    background: #fff;
    max-width: 900px;
    margin: 30px auto;
    padding: 25px;
    border-radius: 8px;
}

/* FORMULÁRIOS */
input, button {
    width: 100%;
    padding: 12px;
    margin-bottom: 12px;
    font-size: 15px;
}

button {
    background: #111;
    color: #fff;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #00aa66;
}

/* TÍTULOS */
h1, h2 {
    margin-bottom: 15px;
}

/* RESPONSIVO */
@media (max-width: 600px) {
    .menu a {
        display: block;
        margin: 8px 0;
    }
}