html, body {
    margin :0;
    padding: 0;
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
}

.container {
    padding: 16px 32px;
    max-width: 1140px;
    margin: auto;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: lightblue;
}

nav.container {
    max-width: 100%;
    margin: none;
}

nav ul li {
    display: inline;
    padding: 0 16px;
}

.brand {
    font-size: 1.2rem;
    font-weight: 700;
}

a {
    text-decoration: none;
}

a:visited {
    color: #0000ee;
}

.offer-box {
    background-color: lightgrey;
    width: 300px;
    padding: 16px;
    border-radius: 4px;
    border: 1px solid grey;
}

.offer-box label {
    display: block;
    padding: 8px 0;
}

.offer-box input {
    padding: 8px;
    width: 100%;
}

button {
    margin: 8px 0;
    padding: 16px;
    box-shadow: none;
    border: none;
    background-color: royalblue;
    color: white;
    font-size: 1rem;
    border-radius: 3px;
    cursor: pointer;
}

img {
    max-width: 100%;
}

#thank-you {
    display: none;
}

hr {
    border: 1px solid lightgrey;
    margin: 32px 0;
}