Tldraw/apps/electron/src/renderer/styles.css

html,
* {
  box-sizing: border-box;
}

body {
  overscroll-behavior: none;
  margin: 0px;
  padding: 0px;
}

.tldraw {
  position: fixed;
  top: 0px;
  left: 0px;
  right: 0px;
  bottom: 0px;
  width: 100%;
  height: 100%;
}