app.css

@import url("https://fonts.googleapis.com/css2?family=Vazirmatn:wght@400;500;700&display=swap");

body {
  direction: rtl;
  font-family: "Vazirmatn", sans-serif;
  background-color: #282c34;
  color: #e3e6ed;
}

h1 {
  font-size: 1.5rem;
  text-align: center;
  margin-bottom: 1rem;
}
img {
  max-width: 100%;
  margin-bottom: 1rem;
  filter: invert(1);
}

.board {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.5rem;
  max-width: 300px;
  margin: auto;
}
.board > * {
  aspect-ratio: 1;
  border: 1px solid #bbb;
  font-size: 2rem;
  display: grid;
  place-content: center;
}
.board > *:hover {
  background-color: #1c1f26;
}

button {
  font-family: inherit;
  font-size: 1rem;
  color: inherit;
  background-color: #363d4b;
  border: none;
  padding: 0.5rem 1.2rem;
  margin: 2rem auto;
  display: block;
  cursor: pointer;
}
button:hover {
  background-color: #34435f;
}

a {
    font-size: inherit;
    color: inherit;
    text-decoration: auto;
}