* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: #000;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: Arial, Helvetica, sans-serif;
}

main {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  background: #000;
}

.flag-link {
  display: block;
  width: 200px;
  line-height: 0;
  cursor: pointer;
}

.flag-link:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 8px;
}

.flag-stage {
  display: block;
  position: relative;
}

.flag-stage img,
.flag-canvas {
  display: block;
  width: 100%;
  height: auto;
}

.flag-stage img {
  transition: opacity 220ms ease;
}

.flag-canvas {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
}

.flag-link.is-waving img {
  opacity: 0.08;
}

.flag-canvas.is-visible {
  opacity: 1;
}

@media (max-width: 700px) {
  .flag-link {
    width: 164px;
  }
}

@media (max-width: 420px) {
  .flag-link {
    width: 140px;
  }
}