style.css

@import url('https://fonts.googleapis.com/css2?family=Comforter&family=Sedgwick+Ave&display=swap');

html {
  box-sizing: border-box; /* prevents padding from stretching div out */
}

body {
  margin:0px;
  min-height: 100vh; /* VH = viewport height, stretches full hieght of screen */
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #777;
}

.button-container {
  background-color: #333;
  padding: 10px 20px;
  border: 1px solid #000;
  border-radius: 5px;
  box-shadow: inset 0 20px 5px -16px #555;
  box-shadow: inset 0 20px 4px -19px rgb(255 255 255 / 40%), 0px 2px 3px #000;
}

button {
  font-family: Sedgwick Ave, cursive;
  cursor: pointer;
  outline: none;
  width: 120px;
  height: 75px;
  font-size: 25px;
  border: 1px solid #000;
  background-color: #777;
  color: #fff;
  background: linear-gradient(to top, #696969, #575757);
  border: 2px solid black;
  border-radius: 7px;
  /* box-shadow:  inset 0 20px 4px -15px rgba(255,255,255, 0.4); */
  box-shadow: inset 0 20px 4px -19px rgb(255 255 255 / 40%),
  0px 1px 3px #000;
}

button:hover {
  border: 2px solid black;
  border-radius: 7px;
}

button:active {
  transform: translateY(3px);
  background: linear-gradient(to bottom, #696969, #575757);
  /* box-shadow: 0px 3px 5px #000; */
  box-shadow: inset 0 20px 4px -19px rgb(255 255 255 / 40%),
  0px 0px 0px #000;
}