body {
    margin: 0;
    overflow: hidden;
    background: white;
}

canvas {
    display: block;
}

#toolbar {
    position: fixed;
    top: 10px;
    left: 10px;
    display: flex;
    gap: 10px;
}

.brush {
    width: 40px;
    height: 40px;
    cursor: pointer;
    border: 2px solid transparent;
}

.brush.active {
    border: 1px solid #ff4d4d;
}

#saveBtn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 40px;
    cursor: pointer;
}

#saveBtn:hover {
    transform: scale(1.05);
}