* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  min-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  background: #000;
}

img.bg {
  display: block;
  width: 100%;
  height: auto;
}