in lib/main.js [620:632]
function toggleStartStop() {
if (document.getElementById("start-button").style.display === "none") {
document.getElementById("start-button").style.display = "block";
} else {
document.getElementById("start-button").style.display = "none";
}
if (document.getElementById("stop-button").style.display === "none") {
document.getElementById("stop-button").style.display = "block";
} else {
document.getElementById("stop-button").style.display = "none";
}
}