body,
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  background-image: url(../Bilder/html_background.png);
  background-color: black;
}

h1 {
  margin-top: 40px;
  margin-bottom: 40px;
  font-size: 2.5rem;
  text-align: center;
  color: white;
  text-shadow: 2px 2px 8px #222;
}

.button {
  display: inline-block;
  margin: 20px auto;
  padding: 18px 48px;
  font-size: 1.3rem;
  font-family: inherit;
  font-weight: bold;
  color: #f1f1f1;
  background: #232323; /* Dunkelgrau, hebt sich dezent vom Hintergrund ab */
  border: 2px solid #353535;
  border-radius: 10px;
  box-shadow: none;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background 0.18s, border 0.18s, color 0.18s;
}

.button:hover,
.button:focus {
  background: #353535; /* Leicht heller beim Hover */
  border: 2px solid #555;
  color: #fff;
  outline: none;
}

@media (max-width: 600px) {
  .button {
    padding: 14px 24px;
    font-size: 1.1rem;
  }
  h1 {
    font-size: 1.3rem;
  }
}