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

html, body {
  width: 100%;
  height: 100%;
}

.full-screen {
  width: 100vw;
  height: 100dvh; /* dvh accounts for mobile browser chrome (address bar, etc.) */
  background-color: #f0f0f0;
}