* {
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Oxygen,
    Ubuntu,
    Cantarell,
    "Open Sans",
    "Helvetica Neue",
    sans-serif;
}
body {
  text-align: center;
}

h1 {
  margin-top: 2rem;
  font-size: 3.5em;
}
.container {
  display: flex;
  justify-content: center;
}
.btn {
  width: 10em;
  height: 10em;
  margin: 10px 5px;
  border: 5px solid black;
  border-radius: 10%;
}
.red {
  background-color: red;
}
.green {
  background-color: green;
}
.blue {
  background-color: blue;
}
.yellow {
  background-color: yellow;
}

button {
  color: white;
  background-color: blue;
  margin-top: 30px;
  height: 30px;
  width: 80px;
  border-radius: 10px;
  font-weight: bold;
  border: 2px solid blue;
}
p{
  margin-top: 50px;
}
/* This is for JS style */
.flashBtn {
  background-color: white;
}
.gameOver {
  background-color: red;
}