style.css

@import url('https://fonts.googleapis.com/css2?family=Barlow:wght@100&display=swap');
html {
  box-sizing: border-box;
}
body {
    margin: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgb(1,37,7,23);
}
h1{
  font-size: 3rem;
  color: darkgray;
  text-shadow: 0 2px 5px rgba(255, 255, 255, 0.7);
  margin-top: 0px;
}
.button-container {
  border: 2px solid black;
  padding: 10px;
  border-radius: 7px;
  box-shadow: inset 0 20px 4px -19px rgba(255, 255, 255, 0.7);
}

button {
  cursor: pointer;
  outline: none;
  width: 120px;
  height: 75px;
  font-family: Barlow, sans-serif;
  font-size: 25px;
  color: white;
  text-shadow: 0 2px 5px black;
  background: linear-gradient(to top, #696969, #575757);
  border: 2px solid black;
  border-radius: 7px;
  box-shadow: inset 0 20px 4px -19px rgba(255, 255, 255, 0.4), 0 12px 12px 0 rgba(0,0,0,0.3);
}
button:hover {
  background: linear-gradient(to bottom, #696969, #575757);
}
button:active {
  transform: translate(3px);
  box-shadow: 0 6px 6px 0 rgba(0,0,0,0.3);
}