* {
    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);
    border-radius: 8px;
}

.pipe {
    position: absolute;
    bottom: 0;
    width: 80px;
    right: -80px;
    animation: pipe-animation 1.5s infinite linear;
}

.mario {
    width: 150px;
    position: absolute;
    bottom: 0;
}

.jump {
    animation: jump 500ms ease-out;
}

.clouds {
    position: absolute;
    width: 550px;
    top: 70px;
    animation: clouds-animation 20s infinite linear;
}

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

.score {
    position: absolute;
    top: 20px;
    right: 20px;
    font-family: 'Arial', sans-serif;
    font-size: 30px;
    color: #333;
    z-index: 10;
    font-weight: bold;
}