body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fef6e4; /* beige */
    color: #001858; /* blue */
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

main > header {
    text-align: center;
    margin-bottom: 1em;
}

main > section {
    margin: 1em;
    padding: 1em;
    border: 1px solid #001858;
    border-radius: 5px;
    background-color: #f3d2c1; /* orange */
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}

main > div > article {
    border: 1px solid #001858;
    padding: 1em;
    margin-bottom: 1em;
    background-color: #fef6e4;
    border-radius: 5px;
    box-shadow: inset 0px 8px 16px 0px rgba(0,0,0,0.2);
}

article > header {
    border-bottom: 1px solid #001858;
    background-color: #001858;
    color: #fef6e4;
    padding: 0.5em;
    margin: -1em -1em 1em -1em;
}

ul.topnav {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #001858;
    position: fixed;
    top: 0;
    width: 100%;
    box-shadow: 0 0.7em 1.2em 0 rgba(0,0,0,0.2);
}

ul.topnav li {
    float: left;
}

ul.topnav li a {
    display: block;
    color: #fef6e4;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

ul.topnav li a:hover {
    background-color: #8bd3dd; /* cyan */
}

ul.topnav li a.active {
    background-color: #f582ae; /* pink */
}

div.topnav {
    height: 3em;
}

div.banner {
    position: fixed;
    bottom: 0;
    width: 100%;
    background-color: #001858;
    padding: 10px;
    text-align: center;
}

div.banner p {
    color: #fef6e4;
    margin: 0;
}

div.banner a {
    color: #8bd3dd;
}

form {
    display: flex;
    flex-direction: column;
}

input, textarea, select {
    margin: 0.5em 0;
    padding: 0.5em;
    border: 1px solid #001858;
    border-radius: 4px;
    background-color: #fef6e4;
    color: #001858;
}

input[type="submit"] {
    background-color: #001858;
    color: #fef6e4;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #8bd3dd;
}

button {
    margin: 0.5em 0;
    padding: 0.5em;
    border: none;
    border-radius: 4px;
    background-color: #001858;
    color: #fef6e4;
    cursor: pointer;
}

button:hover {
    background-color: #8bd3dd;
}

img {
    max-width: 100%;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #333;
        color: #fef6e4;
    }
    main > section {
        background-color: #555;
        border-color: #fef6e4;
    }
    main > div > article {
        background-color: #444;
        border-color: #fef6e4;
    }
    article > header {
        background-color: #222;
        border-color: #fef6e4;
    }
    input, textarea, select {
        background-color: #444;
        color: #fef6e4;
        border-color: #fef6e4;
    }
    input[type="submit"], button {
        background-color: #fef6e4;
        color: #001858;
    }
    input[type="submit"]:hover, button:hover {
        background-color: #8bd3dd;
    }
}

@media (max-width: 600px) {
    ul.topnav li {
        float: none;
        width: 100%;
    }
    main {
        padding: 10px;
    }
    main > section {
        margin: 0.5em;
        padding: 0.5em;
    }
}