van11y-accessible-modal-window-aria/demo/styles.css

ES2015 accessible modal window system, using ARIA (compatible IE9+ when transpiled)

html { 
  font-size: 62.5%;
  /* IE9-IE11 math fixing. See https://connect.microsoft.com/IE/feedback/details/816709/ */
  /* Thanks to @guardian, @victorbritopro, @eQRoeil & Knacss */
  font-size: calc(1em * 0.625);
  box-sizing: border-box; 
}
*, *:before, *:after {
  box-sizing: inherit;
}
body {
  background: #fff;
  color: #444;
  font-family: 'roboto', Arial, sans-serif;
  font-size: 1.8em; /* equiv 18px */
  line-height: 1.5; /* to update if needed */
}


@font-face {
    /*font-family: 'robotoregular';*/
    font-family: 'roboto';
    src: url('https://van11y.net/layout/css/fonts/Roboto-Regular-webfont_20180126.eot');
    src: url('https://van11y.net/layout/css/fonts/Roboto-Regular-webfont_20180126.eot?#iefix') format('embedded-opentype'),
         url('https://van11y.net/layout/css/fonts/Roboto-Regular-webfont_20180126.woff2') format('woff2'),
         url('https://van11y.net/layout/css/fonts/Roboto-Regular-webfont_20180126.woff') format('woff'),
         url('https://van11y.net/layout/css/fonts/Roboto-Regular-webfont_20180126.ttf') format('truetype'),
         url('https://van11y.net/layout/css/fonts/Roboto-Regular-webfont_20180126.svg#robotoregular') format('svg');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    /*font-family: 'robotobold';*/
    font-family: 'roboto';
    src: url('https://van11y.net/layout/css/fonts/Roboto-Bold-webfont_20180126.eot');
    src: url('https://van11y.net/layout/css/fonts/Roboto-Bold-webfont_20180126.eot?#iefix') format('embedded-opentype'),
         url('https://van11y.net/layout/css/fonts/Roboto-Bold-webfont_20180126.woff2') format('woff2'),
         url('https://van11y.net/layout/css/fonts/Roboto-Bold-webfont_20180126.woff') format('woff'),
         url('https://van11y.net/layout/css/fonts/Roboto-Bold-webfont_20180126.ttf') format('truetype'),
         url('https://van11y.net/layout/css/fonts/Roboto-Bold-webfont_20180126.svg#robotobold') format('svg');
    font-weight: bold;
    font-style: normal;
}

@font-face {
    /*font-family: 'robotoitalic';*/
    font-family: 'roboto';
    src: url('https://van11y.net/layout/css/fonts/Roboto-Italic-webfont_20180126.eot');
    src: url('https://van11y.net/layout/css/fonts/Roboto-Italic-webfont_20180126.eot?#iefix') format('embedded-opentype'),
         url('https://van11y.net/layout/css/fonts/Roboto-Italic-webfont_20180126.woff2') format('woff2'),
         url('https://van11y.net/layout/css/fonts/Roboto-Italic-webfont_20180126.woff') format('woff'),
         url('https://van11y.net/layout/css/fonts/Roboto-Italic-webfont_20180126.ttf') format('truetype'),
         url('https://van11y.net/layout/css/fonts/Roboto-Italic-webfont_20180126.svg#robotoitalic') format('svg');
    font-weight: normal;
    font-style: italic;
}

.mw960e {
  max-width: 60em;
  margin: 0 auto;
}
.aligncenter {
  text-align: center;
}
h1,
.h1 {
  display: block;
  font-size: 1.55556em; /* equiv 28px */
  line-height: 1.92857;
  margin: 0 0 .96429em 0;
  font-weight: normal;
}
h2,
.h2 {
  display: block;
  font-size: 1.33333em; /* equiv 24px */
  line-height: 1.125;
  margin: 0 0 1.125em 0;
  font-weight: normal;
}

.link {
  color: #4d287f;
  cursor: pointer;
  text-decoration: none;
  border-bottom: 1px solid #4d287f;
}
/* remember focus */
.link:focus,
.link:hover,
.link:active {
  color: #4d287f;
  border-bottom: 1px solid #4d287f;
  outline: 2px dotted;
}
/* avoid border on images in links + fix border image IE */
.link:link img,
.link:visited img, 
img {
  border-style: none;
}
/* external links */
.link[href^="http://"]:after,
.link[href^="https://"]:after {
  content:"\202f\2197";
  speak: none;
  border-bottom: 1px solid #fff;
  
}

.logo-link,
.logo-link:focus,
.logo-link:hover,
.logo-link:active,
.link.noimg[href^="http://"]:after,
.link.noimg[href^="https://"]:after {
  border-bottom: 0;
}

.link.noimg[href^="http://"]:after,
.link.noimg[href^="https://"]:after {
  content: '';
  speak: none;
}

.button {
  background: #128197;
  font: inherit;
  border: 0;
  color: #fff;
  border-radius: .5em;
  cursor: pointer;
  padding: .25em .5em;
  display: inline-block;
}



/* --------------- styles for modal -----------------------*/

.invisible {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}


.hidden { display: none; }


/* needed for old browsers */
dialog {
  display: block;
  border: 0;
}
/* removes scroll when modal is opened */
.no-scroll {
  overflow: hidden;
}
/* overlay covers everything */
.simple-modal-overlay,
.simple-animated-modal-overlay,
.simple-animatedtransform-modal-overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  background: #fff;
  opacity: .8;
  z-index: 666;
  cursor: pointer;
}
.simple-modal-overlay[data-background-click="disabled"],
.simple-animated-modal-overlay[data-background-click="disabled"],
.simple-animatedtransform-modal-overlay[data-background-click="disabled"],
.simple-left-modal-overlay[data-background-click="disabled"] {
  cursor: auto;
}
.simple-animated-modal-overlay,
.simple-animatedtransform-modal-overlay {
  animation: fadewhite ease .5s 1 normal ;
}

@keyframes fadewhite {
  0% {
    opacity: 0;
  }
  100% {
    opacity: .8;
  }
}
/* modal */
.simple-modal,
.simple-animated-modal,
.simple-animatedtransform-modal {
  position: fixed;
  left: 15%;
  width: 70%;
  top: 5vh;
  max-height: 90vh;
  /*
  If you have problems with vh units 
  top: 5%;
  max-height: 90%;
  */
  border: 2px solid #000; 
  background: #fff;
  z-index: 667;
  padding: 2em;
  right: auto;
  overflow: auto;
}
.simple-modal-close,
.simple-animated-modal-close,
.simple-animatedtransform-modal-close {
  float: right;
  background: #128197;
  border-radius: 1em;
  color: #fff;
  border: 0;
  font: inherit;
  padding: .25em .5em;
  cursor: pointer;
}
.simple-modal-close:focus,
.simple-modal-close:hover,
.simple-modal-close:active {
  outline: 1px dotted #fff;  
}
.simple-modal-close:hover,
.simple-modal-close:active {
  background: #4d287f;
  
}

.simple-animated-modal {
  -webkit-animation: apparition ease .5s 1 normal ;
          animation: apparition ease .5s 1 normal ;
}
.simple-animatedtransform-modal {
  -webkit-animation: pop ease .5s 1 normal ;
          animation: pop ease .5s 1 normal ;
}

@-webkit-keyframes apparition {
  0% {
    opacity: 0;
	  max-height: 0;
	  width: 0;
	  left: 50%;
  }
  100% {
    opacity: 1;
	  max-height: 100%;
	  width: 70%;
	  left: 15%;
  }
}
@keyframes apparition {
  0% {
    opacity: 0;
	  max-height: 0;
	  width: 0;
	  left: 50%;
  }
  100% {
    opacity: 1;
	  max-height: 100%;
	  width: 70%;
	  left: 15%;
  }
}

@-webkit-keyframes pop {
  0% {
    opacity: 0;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
	  -webkit-transform: scale(0);
	          transform: scale(0);
  }
  100% {
    opacity: 1;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
	-webkit-transform: scale(1);
	        transform: scale(1);
	  max-height: 100%;
	  width: 70%;
	  left: 15%;
  }
}
@keyframes pop {
  0% {
    opacity: 0;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
	  -webkit-transform: scale(0);
	          transform: scale(0);
  }
  100% {
    opacity: 1;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
	-webkit-transform: scale(1);
	        transform: scale(1);
	  max-height: 100%;
	  width: 70%;
	  left: 15%;
  }
}


/* another modal styling example */
/* tooltip modal for it’s easy button */
.simple-left-modal-overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  background: rgba(0, 0, 0, .8);
  opacity: .8;
  z-index: 666;
  cursor: pointer;
}

.simple-left-modal {
  left: auto;
  right: 0;
  top: 0;
  bottom: 0;
  height: 100%;
  z-index: 667;
  position: fixed;
  width: 40em;
  max-width: 100%;
  padding: 0 1em 1em 1em;
  font-size: 1em;
  border: 0;
  overflow: auto;
  background-color: #aaa ; /* fallback IE9 */
  background-image:
      -webkit-linear-gradient(
        top,
        #128197 3em,
        #f7f7f7 3em
      );  background-image:
      linear-gradient(
        to bottom,
        #128197 3em,
        #f7f7f7 3em
      );
  background-attachment: local;
}
.simple-left-modal-close {
  position: absolute;
  top: .5em;
  right: 0;
  background: transparent;
  color: #fff;
  border: 0;
  cursor: pointer;
}
.simple-left-modal-title {
  color: #fff;
  font-size: 1.5em;
}

/* it can be easily adapted in media-queries for tablets/mobile */

/* for this example: tablets */
@media (max-width: 55.625em) {

  .simple-modal,
  .simple-animated-modal {
    left: 5%;
    top: 5%;
    height: 90%;
    width: 90%;
  }
  
}

/* for this example: mobile */
@media (max-width: 44.375em) {

  .simple-modal,
  .simple-animated-modal {
    left: 1%;
    top: 1%;
    width: 98%;
    height: 98%;
  }

}