body {
  margin: 0;
}

h1 {
  text-align: center;
}

button {
  display: block;
  padding: 10px 30px;
  background-color: grey;
  border-radius: 5px;
  margin: 20px auto 10px;
  color: white;
  text-transform: uppercase;
  font-size: 14px;
}

.container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  margin: auto;
  width: 615px;
  padding-top: 20px;
}

.square {
  position: relative;
  flex-basis: calc(33.333% - 10px);
  box-sizing: border-box;
  cursor: pointer;
}

.right-line {
  border-right: 2px solid black;
}

.left-line {
  border-left: 2px solid black;
}

.bottom-line {
  border-bottom: 2px solid black;
}

.top-line {
  border-top: 2px solid black;
}

.victory,
.draw {
  display: none;
}

.victory h2,
.draw h2 {
  text-align: center;
  text-transform: uppercase;
  font-size: 30px;
}

.square::after {
  content: '';
  display: block;
  padding-bottom: 100%;
}

.cross::before {
  font-family: "Font Awesome\ 5 Free";
  font-weight: 900;
  content: "\f00d";
  display: inline-block;
  font-style: normal;
  font-variant: normal;
  text-rendering: auto;
  -webkit-font-smoothing: antialiased;
  font-size: 100px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.circle::before {
  font-family: "Font Awesome\ 5 Free";
  content: "\f111";
  display: inline-block;
  font-style: normal;
  font-variant: normal;
  text-rendering: auto;
  -webkit-font-smoothing: antialiased;
  font-size: 100px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}