:root {
  --primary: #1f1f1f;
  --secondary: #1a1919;
  --border: #414040;
  --ic-col: #8a8a8a;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--primary);
  width: 100vw;
  height: 100dvh;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Oxygen,
    Ubuntu,
    Cantarell,
    "Open Sans",
    "Helvetica Neue",
    sans-serif;
}

dialog {
  border: 1px solid var(--border);
  border-radius: 12px;
  background-color: var(--secondary);
  color: #fff;
  user-select: none;
}

dialog::backdrop {
  backdrop-filter: blur(2px);
  background-color: #000000cc;
}

dialog > form {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 42px;
}

dialog > form > div {
  display: flex;
  gap: 20px;
}

dialog > form > div > div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

dialog > form > div > div > input {
  border: 1px solid var(--border);
  border-radius: 4px;
  background-color: transparent;
  padding: 4px;
  color: #fff;
  text-align: center;
}

dialog > form > p {
  font-size: 1.5rem;
}

dialog > form > button:hover {
  opacity: 0.8;
}

.btn {
  cursor: pointer;
  box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background-color: var(--secondary);
  padding: 4px 10px;
  color: #fff;
}

.game {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background-color: var(--secondary);
  padding: 20px;
  width: 400px;
  height: 450px;
}

.game > div {
  display: flex;
  position: relative;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  border: 1px solid #4140405e;
}

.game > div > span {
  position: absolute;
  color: var(--ic-col);
  font-weight: 100;
  font-size: 4rem;
  user-select: none;
}

.game > div:nth-child(1) {
  border-top: none;
  border-left: none;
}

.game > div:nth-child(2) {
  border-top: none;
}

.game > div:nth-child(3) {
  border-top: none;
  border-right: none;
}

.game > div:nth-child(4) {
  border-left: none;
}

.game > div:nth-child(6) {
  border-right: none;
}

.game > div:nth-child(7) {
  border-bottom: none;
  border-left: none;
}

.game > div:nth-child(8) {
  border-bottom: none;
}

.game > div:nth-child(9) {
  border-right: none;
  border-bottom: none;
}