*{
  margin: 0;
  padding: 0;
  line-height: calc(1rem + 0.5rem);
}

*,
*::before,
*::after {
	box-sizing; border-box;
}

html { 
  scroll-behavior: smooth;
}

image,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  user-select: none;
}


/* BOX MODEL EXAMPLE */
font-size: 2rem;
background color: blue;
width: 300px;
height: 100px;
padding: 16px;
border: 5px solid black;
margin: 0;
}


body {
  font-family: FontAwesome; arial, sans-serif; tahoma;
  font-size: 14px;
}

#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  font-size: 16px;
  border: solid;
  outline: none;
  background-color: purple;
  color: white;
  cursor: pointer;
  padding: 15px;
  border-radius: 4px;
}

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