style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    /* background-image: url(./bg-r.jpg); */
    background-image: linear-gradient(rgb(155, 227, 107), rgb(36, 187, 53));
    height: 100vh;
    max-height: 100vh;
    width: 100vw;
    overflow: hidden;
    /* background-color: blue; */
}
#GameArea{
    background-color: #023047;
    width: 400px;
    height: 100vh;
    margin: auto;
    position: relative;
    z-index: 1;
}
#player_car{
    position: absolute;
    top:400px;
    left:0px;
    width: 50px;
    height: 70px;
    z-index: 4;
  
}
.enemy_car{
    /* position: absolute; */
    width: 50px;
    height: 70px;
    
    z-index: 5;

}
.startScreen,.endScreen{
    position: relative;
    background-color: aqua;
    bottom:50vh;
    z-index: 2;
    width: 50%;
    margin: auto;
    text-align: center;
}
.hide{
    display: none;
}
.road{
    width: 10px;
    height:80px;
    background-color: white;
    position: absolute;
    margin-left: 195px;

}
.enemy{
    position: absolute;
    z-index: 5;
}
#score{
    width: 200px;
    height: 50px;
    background-color: cadetblue;
    color: white;
    font-size: 20px;
    position: absolute;
    top:10px;
    left: 10px;
    padding: 10px;
    text-align: center;
    z-index: 5;
}