Hi Sam,
For your problem, try to add height definition like this:
<div class="row" style="height: 50px;">
<canvas id="canvas_led" width="25" height="25"></canvas>
<canvas id="canvas_status" width="550" height="25"></canvas>
<canvas id="canvas_timer" width="70" height="25"></canvas>
</div>
Hope this help!
Regards,
Jacques