html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    background-color: #333;
}

h1, .footer, .bot-button, .preview {
    background-color: #333;
    color: #fff;
    margin:0;
    padding: 1rem;
    text-align: center;
}

button {
    font-size: 6rem;
    color: #fff;
    background-color: #080;
    border-color: #df0;
    padding: 1rem;
    cursor: pointer;
}

.footer {
    margin-top: auto;
}

.footer a {
    text-decoration: none;
    color:#FFF;
    background-color: #800;
    border-radius: 1rem;
    padding: 0.5rem;
}

.preview a {
    text-decoration: none;
    color: #FFF;
    background-color: #008;
    border-radius: 1rem;
    padding: 0.5rem;
}

img {
    width: 100%;
}