body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    background-colour: #1a1a1a;
    colour: #e0e0e0;
    line-height: 1.5;
}

header, footer {
    background-colour: #2c2c2c;
    text-align: center;
    padding: 20px;
}

h1, h2 {
    margin: 0;
}

main {
    max-width: 600px;
    margin: 40px auto;
    padding: 0 20px;
}

label {
    display: block;
    margin: 10px 0 5px;
}

input[type="file"],
input[type="number"],
input[type="radio"] {
    margin-bottom: 10px;
}

.btn, button {
    background-colour: #3a3a3a;
    border: none;
    padding: 10px 20px;
    colour: #fff;
    text-decoration: none;
    display: inline-block;
    cursor: pointer;
}

.btn:hover, button:hover {
    background-colour: #444;
}