body {
  background: linear-gradient(to bottom, #001f3f, #0074D9);
  color: white;
  font-family: 'Segoe UI', sans-serif;
  text-align: center;
  padding: 50px;
}

.container {
  position: relative;
  z-index: 1;
}

button {
  background-color: #FF4136;
  border: none;
  padding: 15px 30px;
  font-size: 1.2em;
  color: white;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 20px;
  box-shadow: 0 0 10px #FFDC00;
}

button:hover {
  background-color: #FF851B;
}

.snowflakes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
}

.snowflake {
  position: absolute;
  top: -50px;
  font-size: 2em;
  animation: fall 10s linear infinite;
  color: #ffffff;
  opacity: 0.8;
}

.snowflake:nth-child(1) {
  left: 10%;
  animation-delay: 0s;
}
.snowflake:nth-child(2) {
  left: 50%;
  animation-delay: 2s;
}
.snowflake:nth-child(3) {
  left: 80%;
  animation-delay: 4s;
}

@keyframes fall {
  0% { top: -50px; transform: rotate(0deg); }
  100% { top: 100vh; transform: rotate(360deg); }
}