:root {
  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.87);
  background-color: #242424;
}

body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-width: 320px;
  min-height: 100vh;
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
}

.tablero {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 5px;
}
.celda {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid black;
  font-size: 2rem;
  cursor: pointer;
  background: #2b2b2b;
  align-items: center;
}