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              <span id="start" class="target"><!-- Hidden anchor to close all modals --></span>
    <span id="about" class="target"><!-- Hidden anchor to open adjesting modal container--></span>
    <div class="modal">
      <div class="content vertical-align-middle">
        <h2>About</h2>
        <article>Lorem ipsum</article>
        <a class="close-btn" href="#start">X</a>
      </div>
    </div>

<div class="page-container">
  <h1>Lorem ipsum dolor sit amet,</h1>
  <p><a href="#about">Open Modal Window</a> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet. Quisque rutrum. Aenean imperdiet. Etiam ultricies nisi vel augue. Curabitur ullamcorper ultricies nisi. Nam eget dui. Etiam rhoncus. Maecenas tempus, tellus eget condimentum rhoncus, sem quam semper libero, sit amet adipiscing sem neque sed ipsum. Nam quam nunc, blandit vel, luctus pulvinar, hendrerit id, lorem. Maecenas nec odio et ante tincidunt tempus. Donec vitae sapien ut libero venenatis faucibus. Nullam quis ante. Etiam sit amet orci eget eros faucibus tincidunt. Duis leo. Sed fringilla mauris sit amet nibh. Donec sodales sagittis magna. Sed consequat, leo eget bibendum sodales, augue velit cursus nunc</p>
</div>
            
          
!
            
              
/* Layout styles */
html, body {
  margin: 0;
  height: 100%;
  font-size: 14px;
  line-height: 1.5;
  font-family: Arial;
}
.page-container {
  /* by y Auke Zwart http://lea.verou.me/css3patterns/#rainbow-bokeh */
  background:
  radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.15) 30%, rgba(255,255,255,.3) 32%, rgba(255,255,255,0) 33%) 0 0,
  radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.1) 11%, rgba(255,255,255,.3) 13%, rgba(255,255,255,0) 14%) 0 0,
  radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.2) 17%, rgba(255,255,255,.43) 19%, rgba(255,255,255,0) 20%) 0 110px,
  radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.2) 11%, rgba(255,255,255,.4) 13%, rgba(255,255,255,0) 14%) -130px -170px,
  radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.2) 11%, rgba(255,255,255,.4) 13%, rgba(255,255,255,0) 14%) 130px 370px,
  radial-gradient(rgba(255,255,255,0) 0, rgba(255,255,255,.1) 11%, rgba(255,255,255,.2) 13%, rgba(255,255,255,0) 14%) 0 0,
  linear-gradient(45deg, #343702 0%, #184500 20%, #187546 30%, #006782 40%, #0b1284 50%, #760ea1 60%, #83096e 70%, #840b2a 80%, #b13e12 90%, #e27412 100%);
  background-size: 470px 470px, 970px 970px, 410px 410px, 610px 610px, 530px 530px, 730px 730px, 100% 100%;
  background-color: #840b2a;
  height: 100%;
}
.page-container a, .page-container a:link, .page-container a:visited, .page-container a:focus {
  padding: 3px 6px;
  background: #b13e12;
  color: white;
  display: inline-block;
  text-decoration: none;
}
.page-container > * {
  width: 940px;
  padding: 20px;
  margin: 0 auto;
  color: white;
}

/* Modal window sample styles */
/* Vertical centering trick https://css-tricks.com/centering-in-the-unknown/ */
.modal::before {
  content: '';
  display: inline-block;
  height: 100%;
  vertical-align: middle;
  margin: 0;
}

.target {
  display: block;
  left: 0;
  position: fixed;
  top: 0;
  width: 0;
  height: 0;
  visibility: hidden;
  pointer-events: none;
 }

.modal {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  text-align: center;
  display: none;
  /* Fallback for legacy browsers */
  background-color: rgba(0,0,0,0.6);
}
.modal > .content {
   text-align: left;
   display: inline-block;
   background-color: #b13e12;
   box-sizing: border-box;
   color: white;
   position: relative;
   width: 500px;
   padding: 20px;
 }

 .modal > .content .close-btn {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 15px;
    height: 15px;
    color: white;
    font-size: 18px;
    text-decoration: none;
 }

 /* Behaviour on legacy browsers */
.target:target + .modal {
    display: block;
}

/* Fallback for IE8 */
.modal.is-expanded {
   display: block;
}
.modal.is-expanded > .content {
  top: 50%;
  margin-top: -45px;
}

/* Making main page blurred when modal window open */
:root .target:target ~ .page-container {
   filter: blur(5px);
  -webkit-filter: blur(5px);
  filter: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' ><filter id='blur5'><feGaussianBlur in='SourceGraphic' stdDeviation='5' /></filter></svg>#blur5"); // for Firefox
  filter:progid:DXImageTransform.Microsoft.Blur(PixelRadius='5');
  overflow: hidden;
}
:root span[id="start"]:target ~ .page-container {
 filter: none;
 -webkit-filter: none;
}

/* Behavior on modern browsers */
:root .modal {
  display: block;
  background-color: transparent;
  transition: transform 0.3s cubic-bezier(0.5, -0.5, 0.5, 1.5);
  transform-origin: center center;
  transform: scale(0, 0);
}
:root .modal > .content {
  box-shadow: 0 5px 20px rgba(0,0,0,0.5);
}
:root .target:target + .modal {
  transform: scale(1, 1);
}
            
          
!
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