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

 .game-board {
    width: 100%;
    height: 500px;
    border-bottom: 15px solid rgba(4, 138, 4, 0.918);
    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;
 }
    
    .mario {
        width: 150px;
        position: absolute;
        bottom: 0;
        
    }
    
    .jump {
        animation: mario-animation 500ms ease-out;
    }

    .clouds {
        position: absolute;
        width: 550px;
        animation: clouds-animation 20s infinite linear;
    }

 @keyframes pipe-animation {
    from {
        right: -80px;
    }

    to {
        right: 100%;
    }
 }

 @keyframes mario-animation {
    0% {
        bottom: 0;
    }

    40% {
        bottom: 180px;
    }

    50% {
        bottom: 180px;
    }

    60% {
        bottom: 180px;
    }

    100% {
        bottom: 0;
    }
    
 }

 @keyframes clouds-animation {
    from {
        right: -550px;
    }

    to {
        right: 100%;
    }
 }