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

.game-board {
    width: 100%;
    height: 500px;
    border-bottom: 15px solid rgb(35, 160, 35);
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    background: linear-gradient(#87CEEB, #E0F6FF);
}
.pipe {
    position: absolute;
    bottom: 0;
    width: 80px;
    animation: pipe-animation 1.5s infinite linear;
}
.jump {
    animation: jump 500ms ease-out;
}
.mario {
    width: 150px;
    position: absolute;
    bottom: 0;
   
}
.clouds {
    position: absolute;
    width: 550px;
    animation: clouds-animation 20s infinite linear ;
}
@keyframes pipe-animation {
    from {
        right: 0;
    }
    to {
        right: 100%;
    }
}
@keyframes jump {
    0% {
        bottom: 0;
    }
    40% {
        bottom: 180px;
    }
    50% {
        bottom: 180px;
    }
    60% {
        bottom: 180px;
    }
    100% {
        bottom: 0;
    }
}
@keyframes clouds-animation {
    from {
        right: -550px;
    }
    to {
        right: 100%;
    }

}