style.css

* {
   margin: 0;
   padding: 0;
   box-sizing:border-box; 
   font-family: 'Julee', cursive;
}

.background {
    position: relative;
    background-color: black;
    width:100%;
    height: 100vh;
}

.start {
    position:absolute;
    width:50%;
    height:100px;
    top:40%;
    left:50%;
    margin-left:-25%;
    text-align:center;

}

.start-text {
    left:50%;
    width:40%;
    margin-left:-20%;
    position:absolute;
    text-align: center;
    border:3px rgb(220, 7, 231) groove;
    border-radius: 15px;
    color: rgb(101, 241, 101);
    
}

.start.active {
    transform:translateY(800px);
    transition:2s;
}

.background.start-text:hover() {
    transform:scale(1.5);
    color:orange;
}

.intro {
    position:absolute;
    color:rgb(101, 241, 101);
    width:50%;
    top:20%;
    left:50%;
    margin-left:-25%;
}

.intro p {
    font-size: 30px;
    text-align:center;
}

.intro.active {
    transform:translateY(-800px);
    transition:2s;
}

.start-text.active {
    opacity:0;
}

#play_button{
    visibility:visible;
    color:rgb(101, 241, 101);
    font-size:30px;
}

.cell {
    width:33%;
    height:33%;
    border: 3px solid black;
    display:flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    background-color: white;
    position:relative;
}

.container {
    
    position: absolute;
    top:50%;
    margin-top:-200px;
    left:0;
    margin-left:-800px;
    display: flex;
    flex-wrap: wrap;
    width:400px;
    height:400px;
    border: 1px solid black;
    
}

.container.active {
    left:50%;
    transform:translateX(600px);
    transition:2s;
}

.player-score {
    position:absolute;
    top:10%;
    width:150px;
    left: -150px;
    color:white;
}

.player-score.active{
    left:20%;
    transition:2s;
}

.robot-score {
    position:absolute;
    top:10%;
    width:150px;
    right: -150px;
    color:white;
}

.robot-score.active {
    right: 20%;
    transition: 2s;

}

.O {
    visibility: hidden;
}

.X {
    visibility: hidden;
}

@media(max-width: 1000px) {
    .start-text {
        font-size: 24px;
    }
}