<div class="stopwatch">
<div class="time-display" id="display">00:00:00</div>
<div class="controls">
<button id="startBtn" class="btn start">Start</button>
<button id="stopBtn" class="btn stop">Stop</button>
<button id="resetBtn" class="btn reset">Reset</button>
</div>
</div>
.stopwatch {
font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
background: #1f2937;
padding: 30px;
border-radius: 20px;
text-align: center;
width: 300px;
margin: 0 auto;
box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.time-display {
font-size: 3.5rem;
font-weight: 700;
color: #fff;
font-variant-numeric: tabular-nums;
margin-bottom: 20px;
text-shadow: 0 0 10px rgba(255,255,255,0.1);
}
.controls {
display: flex;
gap: 10px;
justify-content: center;
}
.btn {
padding: 10px 20px;
border: none;
border-radius: 8px;
font-weight: 600;
cursor: pointer;
transition: transform 0.1s, opacity 0.2s;
font-size: 1rem;
}
.btn:active {
transform: scale(0.95);
}
.start {
background: #10b981;
color: white;
}
.stop {
background: #ef4444;
color: white;
}
.reset {
background: #4b5563;
color: white;
}
let [seconds, minutes, hours] = [0, 0, 0];
let display = document.getElementById("display");
let timer = null;
function stopwatch() {
seconds++;
if (seconds == 60) {
seconds = 0;
minutes++;
if (minutes == 60) {
minutes = 0;
hours++;
}
}
let h = hours < 10 ? "0" + hours : hours;
let m = minutes < 10 ? "0" + minutes : minutes;
let s = seconds < 10 ? "0" + seconds : seconds;
display.innerHTML = h + ":" + m + ":" + s;
}
function startTimer() {
if (timer !== null) {
clearInterval(timer);
}
timer = setInterval(stopwatch, 1000);
}
function stopTimer() {
clearInterval(timer);
}
function resetTimer() {
clearInterval(timer);
[seconds, minutes, hours] = [0, 0, 0];
display.innerHTML = "00:00:00";
}
document.getElementById("startBtn").addEventListener("click", startTimer);
document.getElementById("stopBtn").addEventListener("click", stopTimer);
document.getElementById("resetBtn").addEventListener("click", resetTimer);
