#navbar {
  position: sticky;
  top: 0;
  overflow: hidden;
  background-color: #333;
  z-index: 100;
}

/* Navbar links */
#navbar a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px;
  text-decoration: none;
}

/* Page content */
.content {
  padding: 16px;
}
.bigimage {
    position: static;
    max-width: 100%;
    height: auto;
}

.centered {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.container {
  position: relative;
  text-align: center;
  color: white;
  z-index: 1;
}

footer {
    position: relative;
    text-align: left;
}
#myBtn {
  position: fixed;
  bottom: 20px;
  right: 30px; 
  z-index: 99; 
  border: none; 
  outline: none; 
  background-color: purple;
  color: white;
  padding: 15px;
  border-radius: 10px;
  font-size: 18px;
}

#myBtn:hover {
  background-color: #555;
}