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

h1 {
  font-size: 80px;
  text-align: center;
  padding: 50px 200px;
}

.txt {
  font-size: 25px;
  padding: 50px 200px;
  text-align: justify;
  line-height: 30px;
}

.btn {
  height: 100px;
  width: 100px;
  background: gray;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  right: 20px;
  bottom: 20px;
  cursor: pointer;
}

.icone {
  width: 50px;
}