<!--HTML-->
<button class="btn btn_white" data-modal>кнопка</button>

<div class="modal-1">
<div class="modal__dialog">
<div class="modal__content">
<form action="#">
<div class="modal__close" data-close>&times;</div>
<div class="modal__title">!</div>
</form>
</div></div></div>


<script>
 const modalTrigger = document.querySelectorAll('[data-modal]'),
        modal = document.querySelector('.modal-1'),
        modalCloseBtn = document.querySelector('[data-close]');

    modalTrigger.forEach(btn => {
        btn.addEventListener('click', function() {
            modal.classList.add('show');
            modal.classList.remove('hide');
            document.body.style.overflow = 'hidden';
        });
    });

    function closeModal() {
        modal.classList.add('hide');
        modal.classList.remove('show');
        document.body.style.overflow = '';
    }
    
    modalCloseBtn.addEventListener('click', closeModal);

 </script>

<style>

.modal-1 {
	position: ;
	top: 0;
	left: 0;
	z-index: 1050;
	display: none;
	width: 10px
	height: 10px;
	overflow: hidden;
	background-color: rgba(0, 0, 0, .5)
}

.modal__dialog {
	max-width: 500px;
	margin: 40px auto
}

.modal__content {
	position: relative;
	width: 100%;
	padding: 40px;
	background-color: #fff;
	border: 1px solid rgba(0, 0, 0, .2);
	border-radius: 4px;
	max-height: 80vh;
	overflow-y: auto
}

.modal__close {
	position: absolute;
	top: 8px;
	right: 14px;
	font-size: 30px;
	color: #000;
	opacity: .5;
	font-weight: 700;
	border: none;
	background-color: transparent;
	cursor: pointer
}

.modal__title {
	text-align: center;
	font-size: 22px;
	text-transform: uppercase
}

.modal__input {
	display: block;
	margin: 20px auto 20px auto;
	width: 280px;
	height: 50px;
	background: #fff;
	box-shadow: 0 4px 15px rgba(0, 0, 0, .2);
	border: none;
	font-size: 18px;
	text-align: center;
	padding: 0 20px;
	outline: 0
}

.modal .btn {
	display: block;
	width: 280px;
	margin: 0 auto
}

.show {
	display: block
}

.hide {
	display: none
}

.fade {
	animation-name: fade;
	animation-duration: 1.5s;
}

@keyframes fade {
	from {
    opacity: 0.1;
	}
	to {
    opacity: 1;
	}
}

</style>