style.css

.gamecontainer{
    margin: 0;
    padding: 0;

}
body{
    background-color: red;
    overflow: hidden;
}
.gamecontainer{
    background-image: url(bg.png) ;
    background-repeat: no-repeat;
    background-size: 100vw 100vh;
    width: 100%;
    height: 100vh;
}
.dino{
    background-image: url(dino.png);
    background-repeat: no-repeat;
    background-size: cover;
    height: 114px;
    width: 233px;
    position: absolute;
    bottom: 0;
    left: 52px;
}
.obstacle{
    background-image: url(dragon.png);
    background-size: cover;
    height: 113px;
    width: 164px;
    position: absolute;
    bottom: 0;
    left: 44vw;
}
.obstacleAni{
    animation: obstacleAni 5s linear infinite;
}

.gameOver{
    visibility: hidden;
}
.animateDino{
    animation: dino 0.6s linear;
}
@keyframes dino{
    0%{
        bottom:0
    }
    50%{
        bottom: 422px;
    }
    100%{
        bottom: 0;
    }
}
@keyframes obstacleAni{
0%{
    left: 100vw;
}
100%{
    left: -10vw;;
}
}