* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background-color: black;
  color: whitesmoke;
}
body {
  text-align: center;
}
main {
  height: 100vh;
  width: 100vw;
}

.game {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  width: 20em;
  margin: 0 auto;
}
.btn {
  height: 8rem;
  width: 8rem;
  border-radius: 10%;
}
.green {
  background-color: green;
}
.red {
  background-color: red;
}

.yellow {
  background-color: yellow;
}
.blue {
  background-color: blue;
}
.flash {
  background-color: white;
}
.userflash {
  background-color: cyan;
}
.gameover {
  background-color: red;
}
.roboto-regular {
  font-family: "Roboto", sans-serif;
  font-weight: 400;
  font-style: normal;
}