#myBtn {
  display: none;
  position: fixed;
  bottom: 5px;
  left: 5px;
  z-index: 99;
  border: none;
  outline: none;
  background-color: green;
  color: white;
  cursor: pointer;
}

MyLemonLine {
    display: block;
    height: 1px;
    border: 0;
    border-top: 3px solid #FFDEAD;
    margin: 1em 0;
    padding: 0;
}

MyLightBlueLine {
    display: block;
    height: 1px;
    border: 0;
    border-top: 3px solid teal;
    margin: 1em 0;
    padding: 0;
}

MyShortBlueLine {
    display: block;
    height: 1px;
    border: 0;
    border-top: 3px solid teal;
    margin: 1em 0;
    padding: 0;
    width: 400px;
}