JSFiddle - React, Tailwind, and code Playground

HTML

<form class="formular">
<input required id="login" type="text" placeholder="Логин"><br>
<input required id="pass" type="password" placeholder="Пароль">
<div>
<a class="btns am-trigger btn_submit">Войти</a></form>

CSS

a{
	background: #607D8B;
	padding: 10px;
	position:  relative;
	top: 20px;
	cursor:  pointer;
}

JavaScript

$('a').click(function(){
	if($('#login').val() == '' || $('#pass').val() == ''){
		alert("Заполните все поля!");
	}else{
  if($('#login').val() == 'user4783' || $('#pass').val() == 'QweuyjkrtyUIkLvgg'){alert("Срок действия аккаунта закончен");;}else{alert("Аккаунта не с");}
  }
});