.modal-window {
    position: fixed;
    background-color: rgba(255, 255, 255, 0.25);
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 999;
    visibility: hidden;
    opacity: 0; 
    pointer-events: none;
    -webkit-transition: all 0.3s;
    transition: all 0.3s;
}
.modal-window:target {
    visibility: visible;
    opacity: 0.95;
    pointer-events: auto;
}
.modal-window > div {
    width: 400px;
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    padding: 2em;
    background: #ffffff;
    border-radius: 8px;
}
<!-- // .modal-window header { font-weight: bold; } -->

.modal-window h1 {
    font-size: 150%;
    margin: 0 0 15px;
}

.modal-close {
    color: #757575;
    font-size: 80%;
    position: absolute;
    right: 0;
    text-align: center;
    top: 0;
    text-decoration: none;
    padding: 0.25em 0.5em;
    border: 1px solid;
    border-radius: 5px;
}
.modal-close:hover {
    color: black;
}

.modal-window div:not(:last-of-type) {
    margin-bottom: 15px;
}

.btnlabl {
    color: #757575;
    padding: 0.25em 0.5em;
    text-decoration: none;
    font-size: small;
    border: 1px solid;
    border-radius: 5px;
}
.btnlabl:hover {
    color: black;
}
.btn {
    background-color: #fff;
    padding: 0.25em 0.5em;
    text-decoration: none;
    border: 1px solid;
    border-radius: 5px;

}

.mdlHeader {
    text-align: center;
    background-color: whitesmoke; /* default */
}
.mdlFooter {
    text-align: right;
}

 /* Demo Styles */
// html, body { height: 100%; }
// body {
//     font: 600 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
//     background-image: -webkit-gradient(linear, left top, right top, color-stop(0, #7f53ac), to(#657ced));
//     background-image: linear-gradient(to right, #7f53ac 0, #657ced 100%);
//     color: black;
// }
// a { color: inherit; }

.container {
    display: grid;
    -webkit-box-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    align-items: center;
    // height: 100vh;
}}





 /* Modal messages: */

.modlButt {
	display: inline-block;
	padding: 2px 8px;
    margin: 0 6px;
	color: white;
	background: gray;
	transition: background 1150ms ease-out;
}
.modlButt, .modal__close, .label{
	padding: 3px;
    border: 1px solid;
    border-radius: 5px;
    background: white;
	cursor: pointer;
    margin: 5px;
}
.modlButt:hover, .modlButt:active {
	background: #ff7960;
    cursor: pointer;
    padding: 3px;
    border: 1px solid;
    border-radius: 5px;
	transition: background 1250ms ease-out;
}

.modal {
	position: fixed;
	z-index: 20;
	max-width: 85%;
	width: 30%; /* 400px; */
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	margin: 0 auto;
  box-shadow: 0px 0px 0.4em white; 
  border-radius: 0.4em;
	opacity: 1;
	transition: margin-top 150ms ease-out,  opacity 150ms ease-out;
	background: #eee;
	color: #222;                       /* The dialog is light in both themes: dark text (was the light theme text in dark mode) */
	box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.6);
}
.modal .modlButt { color: #222; }

@media screen and (max-height: 500px) {
	.modal {
		width: 80%;
		height: 80vh;
	}
}

.modal__toggler {
	display: none;
}

.modal__toggler:not(:checked) ~ .modal {
	visibility: hidden;                /* A closed message: its buttons leave the tab order */
	position: absolute;
	overflow: hidden;
	clip: rect(0 0 0 0);
	opacity: 0;
	height: 1px;
	width: 1px;
	margin: -1px;
	padding: 0;
	border: 0;
	margin-top: -10px;
}

.modal__toggler:not(:checked) ~ .modal__mask {
	visibility: hidden;
	position: absolute;
	overflow: hidden;
	clip: rect(0 0 0 0);
	opacity: 0;
	height: 1px;
	width: 1px;
	margin: -1px;
	padding: 0;
	border: 0;
}

.modal__mask {
	position: fixed;
	height: 100%;
	width: 100%;
	top: 0;
	left: 0;
    z-index: 5;
	opacity: 1;
	transition: opacity 150ms ease-out;
	background: RGBA(0, 0, 0, 0.7);
	cursor: pointer;
}

.modal__close::after {
	content: "\2715";
	position: absolute;
	display: inline-block;
	top: 9px;
	right: 10px;
	font-size: 15px;
	font-weight: bold;
	cursor: pointer;
    padding: 3px 6px 1px;
    border: 1px solid;
    border-radius: 5px;
    background: white;
}

.modal__title {
	margin: 0;
}

.modal__header {
	padding: 2px 46px 1px;          /* Room for the close cross (both sides: the title stays centred) */
  border-radius: 0.4em 0.4em 0 0;
	font-size: 15px;
}

.modal__content {
	padding: 5px 20px;
	/* max-height: 30%; */
	max-height: 60vh;
  overflow-y: auto;
  float: left;
}

@media screen and (max-height: 500px) {
	.modal__content {
    max-height: 45vh;
	}
}

.modlwrap {
  display: flex;                  /* Tracking and message side by side, the same height */
  min-height: 100%;
  position:relative;
  background-color: white;
}
.modlwrap:after {
  content: "";
  display: block;
}

.modal__footer {
	padding: 10px 0;
  border-radius: 0 0 0.4em 0.4em;
	text-align: center;
  background-color: #AAAAAA;
  display:table;
  width: 100%;
}

.modal__window {
	max-height: 80vh;
	overflow-y: auto;
	background: #eee;
}