style.css

*, *:after, *:before {
	box-sizing: border-box!important;
}

html, body {
	margin: 0;
	padding: 0;
}

body {
	height: 100vh;
	width: 100vw;
	overflow: hidden;
}
#wrapper {
	display: flex;
}

#right-wrapper, #left-wrapper {
	height: 100vh;
	overflow: auto;
	width: 50vw;
}

.hidden {
	display: none!important;
}

#live-preview {
	padding: 1rem;
}