.photo-annotator .canvas-wrapper {
    position: relative;
    display: inline-block;
}

.photo-annotator img {
    max-width: 100%;
    display: block;
}

.photo-annotator canvas {
    position: absolute;
    inset: 0;
    touch-action: none;
}

.color-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid #555;
    cursor: pointer;
    padding: 0;
}

    .color-btn.red {
        background: red;
    }

    .color-btn.green {
        background: green;
    }

    .color-btn.blue {
        background: dodgerblue;
    }

    .color-btn.yellow {
        background: gold;
    }