:root {
  --main-background: #011f4b;
  --text-color: #b3cde0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  background-color: var(--main-background);
}

body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-color);
  flex-direction: column;
}

.board {
  width: clamp(300px, 50%, 75%);
  height: clamp(350px, 50%, 75%);
  border: var(--text-color) 5px solid;
  color: var(--text-color);
  display: grid;
  grid-template: repeat(3, 1fr) / repeat(3, 1fr);
}

.cell {
  width: 100%;
  height: 100%;
  border: 5px solid white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 5rem;
  cursor: pointer;
}

.top-bar {
  margin-bottom: 1rem;
}
.bottom-bar {
  width: clamp(300px, 50%, 75%);
  display: flex;
  height: auto;
  margin-top: 1rem;
  justify-content: center;
  align-items: center;
}

.message {
  font-size: 1.2rem;
}

.restart {
  border-radius: 3px;
  padding: 1rem;
}

h1 {
  color: var(--text-color);
  margin: 1rem;
}