body {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  max-width: 100%;
  font-family: "Roboto", sans-serif;
  background-color: #00334d;
}

h1 {
  font-size: 128px;
  text-align: center;
  margin: 0 0 15px;
  font-family: "Just Me Again Down Here", cursive;
}

.yellow {
  color: #ffff1a;
}

.green {
  color: #4dff4d;
}

.pink {
  color: #ff4d94;
}

.blue {
  color: #99d6ff;
}

/* three button rows */
.row {
  text-align: center;
}

.key {
  font-size: 60px;
  width: 100px;
  height: 100px;
  margin: 10px;
  cursor: pointer;
  background-color: #002233;
  color: #f2f2f2;
  border: none;
  border-radius: 20px;
  box-shadow: 8px 8px 25px #00111a;
}

.key:hover {
  background-image: linear-gradient(
    90deg,
    #99d6ff 0%,
    #ffff1a 49%,
    #ff4d94 80%,
    #4dff4d 100%
  );
  animation: slidebg 5s linear infinite;
  color: #002233;
}

@keyframes slidebg {
  to {
    background-position: 20vw;
  }
}

.input_container {
  font-family: "Oooh Baby", cursive;
  font-size: 46px;
  color: white;
  letter-spacing: 12px;
  margin: 30px 45px 10px;
  font-weight: bold;
}