style.css

body {
	padding: 2rem;
	font-family: Source Sans Pro,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;
}

iframe {
    border: none;
    width: 100%;
    height: 90vh;
}

.container {
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
    width: 100%
}

@media (min-width: 640px) {
    .container {
        max-width:640px
    }
}

@media (min-width: 768px) {
    .container {
        max-width:768px
    }
}

@media (min-width: 1024px) {
    .container {
        max-width:1024px
    }
}

@media (min-width: 1280px) {
    .container {
        max-width:1280px
    }
}

@media (min-width: 1536px) {
    .container {
        max-width:1536px
    }
}