🤖 Cannot save fiddle

[Tunk009]

Error code

01.3k.09

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Your HTML

<div class="crosshair">
    <div class="circle"></div>
    <div class="dot"></div>
    <div class="line-top"></div>
    <div class="line-bottom"></div>
    <div class="line-left"></div>
    <div class="line-right"></div>
</div>

<div class="controls">
    <button onclick="changeColor('green')">🟢 Xanh</button>
    <button onclick="changeColor('red')">🔴 Đỏ</button>
    <button onclick="changeColor('blue')">🔵 Xanh dương</button>
</div>

Your JavaScript

body {
    background: black;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    overflow: hidden;
}

.crosshair {
    position: relative;
    width: 100px;
    height: 100px;
}

.circle {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid #00ff00;
    border-radius: 50%;
    box-shadow: 0 0 20px #00ff00;
}

.dot {
    position: absolute;
    width: 10px;
    height: 10px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: red;
    border-radius: 50%;
}

.line-top {
    position: absolute;
    top: -20px;
    left: 50%;
    width: 2px;
    height: 20px;
    background: #00ff00;
    transform: translateX(-50%);
}

.line-bottom {
    position: absolute;
    bottom: -20px;
    left: 50%;
    width: 2px;
    height: 20px;
    background: #00ff00;
    transform: translateX(-50%);
}

.line-left {
    position: absolute;
    left: -20px;
    top: 50%;
    width: 20px;
    height: 2px;
    background: #00ff00;
    transform: translateY(-50%);
}

.line-right {
    position: absolute;
    right: -20px;
    top: 50%;
    width: 20px;
    height: 2px;
    background: #00ff00;
    transform: translateY(-50%);
}

.controls {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

button {
    padding: 15px 25px;
    background: #333;
    color: white;
    border: 2px solid #00ff00;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
}

Your CSS

function changeColor(color) {
    const circle = document.querySelector('.circle');
    const lines = document.querySelectorAll('[class^="line-"]');
    
    if (color === 'green') {
        circle.style.borderColor = '#00ff00';
        circle.style.boxShadow = '0 0 20px #00ff00';
        lines.forEach(line => line.style.background = '#00ff00');
    } else if (color === 'red') {
        circle.style.borderColor = '#ff0000';
        circle.style.boxShadow = '0 0 20px #ff0000';
        lines.forEach(line => line.style.background = '#ff0000');
    } else if (color === 'blue') {
        circle.style.borderColor = '#00ffff';
        circle.style.boxShadow = '0 0 20px #00ffff';
        lines.forEach(line => line.style.background = '#00ffff');
    }
}