.letter {

   position: relative;

   top: -webkit-calc(50% - 60px);

   top: calc(50% - 60px);

   text-shadow: 0px 0px 3px white;
   color: red;
   font-size: 25px;
   background: yellow;
   padding: 5px 0px 5px 0px;
   font-weight: bold;

}



#goapp{
	background: #ffff00;
	border-radius: 5px;
	color: black;
	font-size: 17px;
	position: fixed;
	padding: 3px 6px 3px 6px;
	right: 0px;
	top: 0px;
	cursor: pointer;
	-webkit-animation: fade 3s infinite 200ms;

        animation: fade 3s infinite 200ms;
    z-index: 99999999;
	
}
.codinh_app{
	z-index: 100;
	position: fixed;
	left: 0px;
	width: 100%;
	top: 20%;
	display: none;
}


#goapp:hover{
	background: red;
}

.letter:nth-child(1) {

        -webkit-animation: fade 4s infinite 200ms;

        animation: fade 4s infinite 200ms;

}

.letter:nth-child(2) {

        -webkit-animation: fade 4s infinite 400ms;

        animation: fade 4s infinite 400ms;

 }

.letter:nth-child(3) {

        -webkit-animation: fade 4s infinite 600ms;

        animation: fade 4s infinite 600ms;

 }

.letter:nth-child(4) {

        -webkit-animation: fade 4s infinite 800ms;

        animation: fade 4s infinite 800ms;

}

.letter:nth-child(5) {

        -webkit-animation: fade 4s infinite 1000ms;

        animation: fade 4s infinite 1000ms;

}

.letter:nth-child(6) {

        -webkit-animation: fade 4s infinite 1200ms;

        animation: fade 4s infinite 1200ms;

}

.letter:nth-child(7) {

        -webkit-animation: fade 4s infinite 1400ms;

        animation: fade 4s infinite 1400ms;

}

.letter:nth-child(8) {

        -webkit-animation: fade 4s infinite 1600ms;

        animation: fade 4s infinite 1600ms;

}

.letter:nth-child(9) {

        -webkit-animation: fade 4s infinite 1800ms;

        animation: fade 4s infinite 1800ms;

}

.letter:nth-child(10) {

        -webkit-animation: fade 4s infinite 2000ms;

        animation: fade 4s infinite 2000ms;

}
.letter:nth-child(11) {

        -webkit-animation: fade 4s infinite 2200ms;

        animation: fade 4s infinite 2200ms;

}

  

 @-webkit-keyframes fade {

        50% {

            opacity: 0.02;

        }

}

  

 @keyframes fade {

        50% {

            opacity: 0.02;

        }

}	

section #mobile {
  text-align: center;
  transform: translatez(0);
}
section #mobile h3 {
  margin: 25px 0px 10px 0px;
  color: red;
  font-size: 1.4em;
  font-family: 'Open Sans Condensed', sans-serif;
  text-align: center;
}
section #mobile li {
  width: 98px;
  height: 120px;
  display: inline-block;
  margin: 0px 10px 0px -10px;
  list-style: none;
}
section #mobile li div {
  width: 98px; 
  height: 100px;
  color: #fff;
  font-size: 3.4em;
  text-align: center;
  line-height: 100px;
  transition: all 0.5s ease;
}

.picture_jlpt_ios{
	z-index: 1;
	background-image: url('../../../../thu_luyenthi/app/icon.jpg');
}
.picture_jlpt_ios:hover {
  background-image: url('../../../../app/barcode/JLPT_iOS.png');
}
.picture_jlpt_android{
	z-index: 1;
	background-image: url('../../../../thu_luyenthi/app/icon.jpg');
}
.picture_jlpt_android:hover {
  background-image: url('../../../../app/barcode/JLPT_android.png');
}
.picture_japanesegrammar{
	z-index: 1;
	background-image: url('../../../../app/icon_japanesegrammar.png');
}
.picture_japanesegrammar:hover {
  background-image: url('../../../../app/barcode/jp_grammar_iOS.png');
}
.mobile-ios_japanesevocabulary {
	z-index: 1;
	background-image: url('../../../../app/icon_japanesevocabulary.png');
}
.mobile-ios_japanesevocabulary:hover {
  background-image: url('../../../../app/barcode/jp_vocabulary_iOS.png');
}
.picture_web{
	z-index: 1;
	background-image: url('../../../../thu_luyenthi/app/icon_web.jpg');
	-webkit-animation: fade 4s infinite 200ms;
    animation: fade 4s infinite 200ms;

}

section #web li span {
  width: 200px;
  height: 20px;
  display: block;
  padding: 0px 0px;
  color: #5882FA;
  font-family: 'Advent Pro', sans-serif;
  text-transform: uppercase;
  font-size: 1.2em;
  text-align: center;
}
section #web {
  text-align: center;
  transform: translatez(0);
}
section #web h3 {
  margin: 25px 0px 10px 0px;
  color: red;
  font-size: 1.4em;
  font-family: 'Open Sans Condensed', sans-serif;
  text-align: center;
}
section #web li {
  width: 200px;
  height: 120px;
  display: inline-block;
  margin: 0px 10px 0px -10px;
  list-style: none;
}
section #web li div {
  width: 200px; 
  height: 100px;
  color: #fff;
  font-size: 3.4em;
  text-align: center;
  line-height: 100px;
  transition: all 0.5s ease;
}
section #web li div:hover {
  border-radius: 100px;
}

.btn-custom {
  margin-left:-17px;
  margin-bottom: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
  position: relative;
  display: inline-block;
  padding: 0.5rem 0.5rem;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  letter-spacing: 0.1em;
  color: #212529;
  border-radius: 0.5rem;
}

.btn-solid-gold {
  color: #b1921b;
  border-right: 4px solid #cea82c;
  border-bottom: 10px solid #987c1e;
  border-left: 4px solid #ffed8b;
  border-radius: 0;
  background: -webkit-gradient(linear, right top, left top, from(#ffd75b), color-stop(30%, #fff5a0), color-stop(40%, #fffabe), color-stop(50%, #ffffdb), color-stop(70%, #fff5a0), to(#fdd456));
  background: -webkit-linear-gradient(right, #ffd75b 0%, #fff5a0 30%, #fffabe 40%, #ffffdb 50%, #fff5a0 70%, #fdd456 100%);
  background: linear-gradient(-90deg, #ffd75b 0%, #fff5a0 30%, #fffabe 40%, #ffffdb 50%, #fff5a0 70%, #fdd456 100%);
  text-shadow: -1px -1px 1px #ffffd9;
}

.btn-solid-gold:hover {
  margin-top: 3px;

  color: #b1921b;
  border-right: 4px solid #cea82c;
  border-bottom: 7px solid #987c1e;
  border-left: 4px solid #ffed8b;
}