style.css

.background{
    width: 100vw;
    height: 100vh;
    background-image: url("Background.jpg");
    background-size: cover;
    overflow-x: hidden;
    position: absolute;
}

.body{
    margin: 0px;
}

.player{
    height: 200px;
    position: absolute;
    margin-top: 550px;
    margin-left: 100px;

}

.score{
    position: absolute;
    font-size: 90px;
    font-family: "Arial";
    font-weight: bold;
    margin-left: 30px;
}

.block{
    position: absolute;
    width: 60px;
    height: 90px;
    background-image: url("spikes.gif");
    background-size: cover;
    margin-top: 670px;
}

.ogameOverTXT{
    width: 300px;
    margin-top: 10px;
    position: absolute;
    margin-left: 200px;
}

.endST{
    position: absolute;
   color: black;
   margin-top: 25px;
   font-family: "Arial";
   font-size: 30px;
   font-weight: bold;
   margin-left: 10px;
}

.gameTitle{
    width:500px;
    position: absolute;
    margin-top: 100px;
    margin-left: 400px; 
}

.startSC{
    width: 300px;
    position: absolute;
    margin-top: 330px;
    margin-left: 520px;

}

.startST1{
   position: absolute;
   color: rgb(58, 13, 131);
   margin-top: 670px;
   font-family: "Arial";
   font-size: 30px;
   font-weight: bold;
   margin-left: 420px;

}

.startST2{
    position: absolute;
    color: rgb(58, 13, 131);
    margin-top: 700px;
    font-family: "Arial";
    font-size: 30px;
    font-weight: bold;
    margin-left: 360px;
 
 }

.btn{
    width: 300px;
    height: 40px;
    background-color: rgb(216, 50, 113);
    border: none;
    font-family: "Arial";
    font-size: 15px;
    font-weight: bold;
    color: rgb(9, 17, 36);
    cursor: pointer;
    margin-top: 20px;
    border-radius: 5px;
}

.startScreen{
    width: 100vw;
    height: 100vh;
    background-image: url("Background.jpg");
    background-size: cover;
    overflow-x: hidden;
    position: absolute;
    visibility: visible;
}

.gameOver{
    position: absolute;
    width: 100vw;
    height: 100vh;
    margin: 0px;
    background-image: url("Background.jpg");
    background-size: cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    visibility: hidden;
}