body {
    font-family: 'Fira Sans', sans-serif;

    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

button {
    cursor: pointer;
}

.controls {
    display: flex;
    flex-flow: row nowrap;
}