Random Password Generator

<html lang="en">
<head>
    <title>Random Password Generator</title>
    
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.2/css/all.min.css">
    
    <link rel="preconnect" href="https://fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@500&display=swap" rel="stylesheet">
    
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <input type="text" id="output">
        <button>
            <i class="fas fa-random" onclick="genPassword()"></i>
        </button>
        <button>
            <i class="far fa-copy" onclick="copyClipboard()"></i>
        </button>
        <input type="range" id="length" min="8" max="40" value="8" oninput="genPassword()">
        <h3 id="length-val">4</h3>
    </div>

<script>
// ABCDEFGHIJKLMNOPQRSTUVWXYZ
// abcdefghijklmnopqrstuvwxyz
// !\"$%&/()=?@~`\\.\';:+=^*_-
// 0123456789

const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!\"$%&/()=?@~`\\.\';:+=^*_-0123456789';
let output = document.getElementById("output");

function randomValue(value){
    return Math.floor(Math.random()*value);
}

function genPassword(){
    let length = document.getElementById('length').value;
    document.getElementById("length-val").textContent = length;
    let str = '';

for(let i=0; i<length ; i++){
        let random = randomValue(characters.length);
        str += characters.charAt(random);
    }
    output.value = str;

}

function copyClipboard(){
    output.select();
    document.execCommand('copy');
    alert("Password Copied!");
}
genPassword();

</script>
</body>

<style>

*,
*:before,
*:after{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    outline: none;
}
body{
    height: 100vh;
    background: linear-gradient(
        -135deg,
        #0048ce,
        #008bfd
    );
}
.container{
    width: 40%;
    min-width: 450px;
    background-color: #1c1e21;
    padding: 80px 30px;
    position: absolute;
    transform: translate(-50%,-50%);
    top: 50%;
    left: 50%;
    border-radius: 8px;
    box-shadow: 0 15px 20px rgba(0,0,0,0.15);
}
#output{
    background-color: transparent;
    border:none;
    border-bottom: 2px solid #e2e2e2;
    width: 75%;
    height: 35px;
    padding: 20px 5px;
    font-family: 'Roboto Mono', monospace;
    color: #f5f5f5;
    font-size: 18px;
    letter-spacing: 1px;
}
button{
    width: 11%;
    height: 38px;
    background-color: transparent;
    border: none;
    color: #ffffff;
    font-size: 18px;
    float: right;
    text-align: right;
    cursor: pointer;
}
input[type="range"]{
    -webkit-appearance: none;
    appearance: none;
    width: 85%;
    height: 3.5px;
    margin-top: 80px;
    background-color: #e2e2e2;
    border-radius: 3.5px;
}
input[type="range"]::-webkit-slider-thumb{
    -webkit-appearance: none;
    appearance: none;
    height: 20px;
    width: 20px;
    background-color: #008bfd;
    border-radius: 50%;
}
h3{
    font-family: 'Roboto Mono',sans-serif;
    display: inline-block;
    width: 10%;
    color: #1c1e21;
    background-color: #ffffff;
    text-align: center;
    padding: 5px 0;
    margin-left: 3%;
    border-radius: 3px;
    font-size: 18px;
}

</style>

</html>

demo

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Random Password Generator