body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #e0f7fa;
}

#game-container {
    width: 800px;
    max-width: 100%;
    border: 2px solid #00897b;
    border-radius: 10px;
    background-color: #ffffff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

header {
    background-color: #004d40;
    color: white;
    padding: 20px;
    text-align: center;
}

#stats {
    display: flex;
    justify-content: space-around;
    background-color: #00796b;
    padding: 10px;
    border-radius: 10px;
    margin-top: 10px;
}

#game-area {
    position: relative;
    padding: 20px;
    height: 400px;
    background-color: #c8e6c9;
    border-radius: 10px;
}

#instructions {
    margin-bottom: 20px;
    background-color: #80cbc4;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    color: white;
    font-weight: bold;
}

footer {
    background-color: #004d40;
    color: white;
    text-align: center;
    padding: 10px;
}

button {
    background-color: #00796b;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin: 5px;
}

button:disabled {
    background-color: #004d40;
    cursor: not-allowed;
}

.litter, .tree {
    position: absolute;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background-size: cover;
    background-repeat: no-repeat;
}

.litter {
    background-image: url('assets/litter.png');
}

.tree {
    background-image: url('assets/tree.png');
}