body {
    font-family: sans-serif;
    margin: 0;
    overflow: hidden;
}
.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: 10px;
    background-color: #f0f0f0;
    border-bottom: 1px solid #ccc;
}
.tool-group {
    display: flex;
    align-items: center;
    margin-right: 20px;
    margin-bottom: 5px;
}
.tool-group label {
    margin-right: 5px;
}
.tool.active {
    background-color: #007bff;
    color: white;
}
canvas {
    display: block;
}