WebProjects/SimpleStopwatch.html at main · iamx-ariful-islam/WebProjects · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Stopwatch</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: system-ui, sans-serif;
        }

        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: #0f172a;
            color: white;
        }

        .box {
            background: #1e293b;
            padding: 40px 30px;
            border-radius: 24px;
            text-align: center;
            width: 340px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }

        h2 {
            color: #94a3b8;
            font-size: 16px;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 15px;
        }

        .time {
            font-family: monospace;
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 25px;
            color: #38bdf8;
        }

        .btn-group {
            display: flex;
            gap: 10px;
        }

        button {
            flex: 1;
            padding: 12px;
            font-weight: 600;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .start {
            background: #0284c7;
            color: white;
        }

        .stop {
            background: #ef4444;
            color: white;
        }

        .reset {
            background: #475569;
            color: white;
        }

        button:hover {
            opacity: 0.9;
        }
    </style>
</head>

<body>
    <div class="box">
        <h2>Stopwatch</h2>
        <div class="time" id="display">00:00.0</div>
        <div class="btn-group">
            <button class="start" onclick="start()">Start</button>
            <button class="stop" onclick="stop()">Stop</button>
            <button class="reset" onclick="reset()">Reset</button>
        </div>
    </div>
    <script>
        let timer = null, ms = 0, sec = 0, min = 0;
        function start() {
            if (timer) return;
            timer = setInterval(() => {
                ms++;
                if (ms >= 10) { ms = 0; sec++; }
                if (sec >= 60) { sec = 0; min++; }
                document.getElementById("display").innerText =
                    `${String(min).padStart(2, '0')}:${String(sec).padStart(2, '0')}.${ms}`;
            }, 100);
        }
        function stop() { clearInterval(timer); timer = null; }
        function reset() { stop(); ms = sec = min = 0; document.getElementById("display").innerText = "00:00.0"; }
    </script>
</body>

</html>