*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    background-color: black;
    margin-top: 100px;
}

.game_container{
    margin: auto;
    width: 450px;
    height: 600px;
    background: url("IMG/background.jpg") no-repeat center fixed;
    background-size: cover;
    overflow: hidden;
    /* display: flex; */
}

#bird-1{
    width: 50px;
    height: 50px;
    position: relative;
    top: 10px;
    z-index: 11;
}

.pillars{
    position: relative;
    bottom: 55px;
    height: 600px;
}

#pillarUp , #pillarDown{
    background-color: aqua;
    width: 90px;
    /* transition: all ease 1; */
    /* animation: sideMove 2s infinite linear; */
}

@keyframes sideMove {
    0%{
        right: -102px;
    }
    50%{
        right: 200px;
    }
    100%{
        right: 500px;
    }
}

#pillarUp{
    position: absolute;
    right: 0;
    top: 0;
    height: 240px;
}
#pillarDown{
    position: absolute;
    right: 0;
    bottom: 0;
    height: 240px;
}

.play_container{
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 70px;
    top: 210px;
    background-color: rgba(0, 0, 0, 0.415);
    width: 300px;
    height: 200px;
}

#play{
    position: absolute;
    width: 100px;
    height: 50px;
    background-color: green;
    color: white;
    border: solid red 1px;
    cursor: pointer;
}