style.css

body {
  margin: 0;
  padding: 0;
  font-family: "Poppins", sans-serif;
  animation: colorChange 10s ease infinite;
}

@keyframes colorChange {
  0% {
    background-color: #0076f4; 
  }
  25% {
    background-color: #522fff; 
  }
  50% {
    background-color: #ff9800; 
  }
  75% {
    background-color: #f4511e; 
  }
  100% {
    background-color: #d32f2f; 
  }
}


.wrapper {
  width: 33.75em;
  background-color: #ffffff;
  position: absolute;
  padding: 2em;
  transform: translateX(-50%);
  left: 50%;
  top: 1.25em;
  border-radius: 0.5em;
}
.container {
  margin: 1.25em auto;
  width: 33.75em;
  border-radius: 0.6em;
  overflow: hidden;
  background-color: #416cea;
}
#information {
  display: grid;
  width: 100%;
  grid-template-columns: 1fr 1fr;
}
.player-wrappers {
  display: flex;
  align-items: center;
  flex-direction: column;
}
.player1:before {
  content: "";
  display: inline-block;
  width: 3.12em;
  height: 3.12em;
  border-radius: 50%;
  background: radial-gradient(#fff04e 1.12em, #ffc400 1.25em);
}
.player2:before {
  content: "";
  display: inline-block;
  width: 3.12em;
  height: 3.12em;
  border-radius: 50%;
  background: radial-gradient(#ff4747 1.12em, #c00303 1.25em);
}
#playerTurn {
  margin: 1em 0;
  text-align: right;
}
#playerTurn span {
  font-weight: 600;
}
.startScreen {
  position: absolute;
  top: 0;
  height: 100vh;
  width: 100vw;
  animation: colorChange 10s ease infinite;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.startScreen button {
  background-color: #ffffff;
  font-size: 1.4em;
  padding: 1em 2em;
  border: none;
  outline: none;
  border-radius: 2em;
  cursor: pointer;
  transition: .8s ease;
}
.startScreen button:hover
{
  transform: scale(1.5);
  background-color: black;
  color: white;
}
.grid-row {
  margin: 0 auto;
  display: flex;
}
.grid-box {
  width: 5em;
  height: 5em;
  display: grid;
  place-items: center;
  background: radial-gradient(rgb(245, 243, 242) 1.37em, #7162f6 1.43em);
  cursor: pointer;
}
.hide {
  display: none;
}
#message {
  margin-bottom: 1em;
  color: #ffffff;
  font-size: 1.2em;
}