body {
    background: black;
    color: #00ffcc;
    text-align: center;
    font-family: Arial, sans-serif;
}

h1 {
    text-shadow: 0 0 15px #00ffcc;
}

.game {
    width: 600px;
    height: 200px;
    border: 2px solid #00ffcc;
    margin: 30px auto;
    position: relative;
    overflow: hidden;
    background: #111;
}

#player {
    width: 40px;
    height: 40px;
    background: #00ffcc;
    position: absolute;
    bottom: 0;
    left: 50px;
}

#obstacle {
    width: 30px;
    height: 50px;
    background: red;
    position: absolute;
    bottom: 0;
    right: -30px;
}

.jump {
    animation: jump 0.6s linear;
}

@keyframes jump {
    0% { bottom: 0; }
    50% { bottom: 100px; }
    100% { bottom: 0; }
}

button {
    padding: 10px 20px;
    background: #00ffcc;
    border: none;
    cursor: pointer;
    font-weight: bold;
    margin-top: 15px;
}