body{
    margin: 0;
}
.cortain{
    background-color: white;
    position: absolute;
}
#cortain-left{
    width: 400px;
    height: 100%;
    top: 0;
    left: 0;
}
#cortain-right{
    width: 200px;
    height: 100%;
    top: 0;
    left: 1000px;
}
#cortain-top{
    width: 120%;
    height: 20px;
    top: 0;
    left: 0;
}
#cortain-bottom{
    width: 120%;
    height: 100%;
    top: 620px;
    bottom: 0;
}
#container{
    height: 600px;
    width: 600px;
    margin-top: 20px;
    margin-left: 400px;
    position: relative;
    z-index: -3;
    background-image: url("./background.png")
}
.bird{
    background-image: url("./Bird.png");
    height: 30px;
    width: 30px;
    position: absolute;
    border-radius: 50%;
    z-index: -2;
}
.upper_pipe{
    background-image: url('./Pipe.png');
    height: 500px;
    width: 60px;
    position: absolute;
    z-index: -1;
}
#score{
    font-size: 40px;
    margin-left: 400px;
    z-index: 1;
    position: relative;
}
#high_score{
    font-size: 40px;
    margin-left: 400px;
    z-index: 1;
    position: relative;
}
#alive{
    font-size: 40px;
    margin-left: 400px;
    z-index: 1;
    position: relative;
}
#high_score_official{
    font-size: 40px;
    margin-left: 400px;
    z-index: 1;
    position: relative;
}