sass-toolkit/tests/controls/05-kickstart.css

Think of Toolkit as your swiss army knife for modern design and development.

html {
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

*, *:before, *:after {
  box-sizing: inherit;
}

embed,
img,
object,
video {
  max-width: 100%;
  height: auto;
}