* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  padding: 0;
}

body {
  overflow: hidden;
  background: #000;
}

.fullscreen-image {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  background-image: url("cognitif.png");
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* Fallback für mobile Browser mit dynamischer Adressleiste */
@supports (height: 100dvh) {
  .fullscreen-image {
    height: 100dvh;
  }
}