body {
  margin: 0;
  padding: 0;
  font-family: sans-serif; /* system font */
  text-align: center;
  color: #fff;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  background: linear-gradient(to bottom, #4facfe, #00f2fe);
  position: relative;
}

.cloud {
  position: absolute;
  background: #ffffff55;
  border-radius: 50%;
  opacity: 0.6;
  animation: moveClouds 60s linear infinite;
}

.cloud1 {
  width: 200px;
  height: 60px;
  top: 50px;
  left: -250px;
}

.cloud2 {
  width: 150px;
  height: 50px;
  top: 120px;
  left: -200px;
  animation-duration: 90s;
}

@keyframes moveClouds {
  0% { transform: translateX(0); }
  100% { transform: translateX(110vw); }
}

#weather-info {
  margin-top: 50px;
  font-size: 20px;
}

button {
  padding: 10px 20px;
  margin-top: 20px;
  cursor: pointer;
  font-size: 16px;
  border: none;
  border-radius: 6px;
  background-color: rgba(255,255,255,0.3);
  color: #fff;
  transition: 0.3s;
}

button:hover {
  background-color: rgba(255,255,255,0.6);
}