* {
  padding: 0px;
  margin: 0px;
  font-family: sans-serif;
}

#header {
  width: 100%;
  background-color: #222;
  overflow: hidden;
  position: fixed;
  top: 0;
}

.top-1 {
  text-align: center;
  padding: 10px;
}

.top-1 h1 {
  color: #ffffff;
  font-size: 25px;
}

.top-1 h2 {
  color: #fdc33d;
  font-size: 25px;
}

.top-2 {
  padding: 10px;
  background-color: #e6e5e5;
  color: #606060;
}

.top-2 ul {
  font-size: 20px;
  display: flex;
  word-wrap: break-word;
  justify-content: space-around;
  list-style: none;
}

#my-app {
  background-image: url('https://images.pexels.com/photos/147465/pexels-photo-147465.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500');
  background-size: cover;
  background-position: center;
  background-color: black;
  transition: 0.5s ease;
  height: 100vh;
  display: flex;
  justify-content: center;
  justify-items: center;
  align-items: center;
}

#main {
  height: 100vh;
}

#btn-alert {
  width: 10rem;
  padding: 1rem;
  font-size: 1.2rem;
  border: 4px solid white;
  border-radius: 15px;
  background-color: dodgerblue;
  color: white;
  outline: none;
}

#btn-alert:hover {
  cursor: pointer;
  background-color: white;
  color: dodgerblue;
  border: 4px solid dodgerblue;
}