JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
	<title>Exercicio com Arrays</title>
	<meta charset="utf-8">
	<script type="text/javascript" src="scripts.js"></script>
	<link rel="stylesheet" type="text/css" href="style.css">
	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">
</head>
<body>
	<div class="container-fluid text-center">
		<div id="site">
			<div id="fibonacci">
				<fieldset>
					<legend>Sequência de Fibonacci:</legend>
					Limite Fibonacci: <input type="number" id="numFibonacci" min="1" value="1"><br>
					<button>Exibir elemento na posição</button>
				</fieldset>
			</div>
			<div id="vetor">
				<form id="formVetor" action="post">
					<fieldset>
						<legend>Vetor</legend>
						<input type="text" name="inputVetor" id="input0">
						<input type="text" name="inputVetor" id="input1">
						<input type="text" name="inputVetor" id="input2">
						<input type="text" name="inputVetor" id="input3">
						<input type="text" name="inputVetor" id="input4">
						<input type="text" name="inputVetor" id="input5">
						<input type="text" name="inputVetor" id="input6">
						<input type="text" name="inputVetor" id="input7">
						<input type="text" name="inputVetor" id="input8">
						<input type="text" name="inputVetor" id="input9">
					</fieldset>
					<button name="exibir" onClick="calcularMaior()">Exibir MAIOR elemento</button>
					<button name="exibir">Exibir MENOR elemento</button>
				</form>
			</div>
		</div>
	</div>
</body>
</html>

CSS

div#site{
	margin-top: 20px;
}
div#fibonacci{
	width: 50%;
	float: left;
}
div#vetor{
	width: 50%;
	float: right;
}
input#numFibonacci{
	width: 60px;
	margin-bottom: 5px;
}
input[name="inputVetor"]{
	width: 45px;
	margin-left: 5px;
	margin-right: 5px;
}
legend{
	font-weight: bold;
}
button[name="exibir"]{
	margin-left: 5px;
	margin-right: 5px;
	margin-top: 5px;
}

JavaScript

var i;
function calcularMaior() {
    var n = new Array(10);
    for(i = 0; i < 10; i++) {
        var input = "input";
        var inputNumero = "" + i.toString();
        var inputId = input.concat(inputNumero);
        n[i] = document.getElementById(inputId).innerHTML;
    }
    alert("Array 0 = " + n[0];
}