如何让CSS的背景色覆盖整个浏览器窗口？

html, body {
  height: 100%;
  margin: 0;
}

body {
  background-color: #f1f1f1;
}

body {
  margin: 0;
}

.container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #f1f1f1;
}

body {
  margin: 0;
  background-color: #f1f1f1;
}

.container {
  height: 100vh;
  width: 100vw;
}