Page Fold - Josh Johnson a complete tutorial for the page fold effect on - http://designshack.net/articles/css/code-a-simple-folded-corner-effect-with-css/

pagefold.css

* {
  margin: 0;
  padding: 0px;
}

body {
  background: #272822;
}

.page {
  background: #fff;
  width: 250px;
  height: 330px;
  margin: 20px;
  float: left;
  
  background: #ffffff; /* Old browsers */
  background: -moz-linear-gradient(top,  #ffffff 0%, #e5e5e5 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#e5e5e5)); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  #ffffff 0%,#e5e5e5 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  #ffffff 0%,#e5e5e5 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  #ffffff 0%,#e5e5e5 100%); /* IE10+ */
  background: linear-gradient(top,  #ffffff 0%,#e5e5e5 100%); /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#e5e5e5',GradientType=0 ); /* IE6-9 */
}

.page h2 {
  padding: 85px 0 0 20px;
  font: 400 35px/1.5 'Lilita One', Helvetica, sans-serif;
}

.page p {
  padding: 10px 20px;
  font: 12px/1.5 Helvetica, sans-serif;
  color: #4b4b4b;
}

.curltl {
  position: relative;
  -webkit-box-shadow: 5px 5px 5px rgba(0,0,0,0.8);
  -moz-box-shadow: 5px 5px 5px rgba(0,0,0,0.8);
  box-shadow: 5px 5px 5px rgba(0,0,0,0.8);
}

.curltl:before {
  content: "";
  position: absolute;
  top: 0%;
  left: 0%;
  width: 0px;
  height: 0px;
  border-bottom: 70px solid #eee;
  border-left: 70px solid transparent;
  -webkit-box-shadow: 7px 7px 7px rgba(0,0,0,0.3);
  -moz-box-shadow: 7px 7px 7px rgba(0,0,0,0.3);
  box-shadow: 7px 7px 7px rgba(0,0,0,0.3);
}

.curltl:after {
  content: "";
  position: absolute;
  top: 0%;
  left: 0%;
  width: 0px;
  height: 0px;
  border-top: 69px solid #272822; 
  border-right: 69px solid transparent;
}

.curltr {
  position: relative;
  -webkit-box-shadow: -5px 7px 5px rgba(0,0,0,0.8);
  -moz-box-shadow: -5px 7px 5px rgba(0,0,0,0.8);
  box-shadow: -5px 7px 5px rgba(0,0,0,0.8);
}

.curltr:before {
  content: "";
  position: absolute;
  top: 0%;
  right: 0%;
  width: 0px;
  height: 0px;
  border-bottom: 70px solid #eee;
  border-right: 70px solid transparent;
  -webkit-box-shadow: -7px 7px 7px rgba(0,0,0,0.3);
  -moz-box-shadow: -7px 7px 7px rgba(0,0,0,0.3);
  box-shadow: -7px 7px 7px rgba(0,0,0,0.3);
}

.curltr:after {
  content: "";
  position: absolute;
  top: 0%;
  right: 0%;

  width: 0px;
  height: 0px;
  border-top: 69px solid #272822; 
  border-left: 69px solid transparent;
}