body {
    margin: 0;
    overflow: hidden;
    background: #87CEEB;
    font-family: Arial;
}

canvas {
    display: block;
}

#startScreen, #gameOverScreen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#gameOverScreen {
    display: none;
}

button {
    padding: 10px 20px;
    font-size: 18px;
    cursor: pointer;
}

#catimg {
    height: 50%;
    width: 20%;
}