.bt-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 0;
    border: 0 solid;
    background-color: rgba(0,0,0,0);
    -webkit-backface-visibility: hidden;
    -webkit-transition: border-width 0.3s, background-color 0.3s, height 0s 0.3s;
    transition: border-width 0.3s, background-color 0.3s, height 0s 0.3s;
    z-index:1000;
}
.bt-menu.bt-menu-open {
    height: 100%;
    background-color: rgba(0,0,0,0.3);
    -webkit-transition: border-width 0.3s, background-color 0.3s;
    transition: border-width 0.3s, background-color 0.3s;
}
.bt-overlay {
    position: absolute;
    width: 100%;
}
.bt-menu-open .bt-overlay {
    height: 100%;
}
.bt-menu-trigger {
    position: fixed;
    z-index: 1000;
    display: block;
    cursor: pointer;
}
.bt-menu-trigger span {
    position: absolute;
    top: 50%;
    left: 0;
    display: block;
    width: 100%;
    height: 4px;
    font-size: 0;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-transition: background-color 0.3s;
    transition: background-color 0.3s;
}
.bt-menu-open .bt-menu-trigger span {
    background-color: transparent;
}
.bt-menu-trigger span:before, .bt-menu-trigger span:after {
    position: absolute;
    left: 0;
    width: 100%;
    height: 100%;
    content: '';
    -webkit-transition: -webkit-transform 0.3s;
    transition: transform 0.3s;
}
.bt-menu-trigger span:before {
    -webkit-transform: translateY(-250%);
    transform: translateY(-250%);
}
.bt-menu-trigger span:after {
    -webkit-transform: translateY(250%);
    transform: translateY(250%);
}
.bt-menu-open .bt-menu-trigger span:before {
    -webkit-transform: translateY(0) rotate(45deg);
    transform: translateY(0) rotate(45deg);
}
.bt-menu-open .bt-menu-trigger span:after {
    -webkit-transform: translateY(0) rotate(-45deg);
    transform: translateY(0) rotate(-45deg);
}
.bt-menu ul {
    position: fixed;
    margin: 0;
    padding: 0;
    list-style: none;
}
.bt-menu ul:first-of-type li, .bt-menu ul li a {
    display: block;
}
.bt-menu ul:nth-of-type(2) li {
    display: inline-block;
    font-size: 0;
}
.bt-menu ul li {
    visibility: hidden;
    opacity: 0;
    -webkit-transition: -webkit-transform 0.3s, opacity 0.2s, visibility 0s 0.3s;
    transition: transform 0.3s, opacity 0.2s, visibility 0s 0.3s;
}
/********************************************* Animation *********************************************/
/* First menu bottom*/
.bt-menu-br ul:first-of-type li:first-child, .bt-menu-bl ul:first-of-type li:first-child {
    -webkit-transform: translate3d(0,100%,0);
    transform: translate3d(0,100%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(2), .bt-menu-bl ul:first-of-type li:nth-child(2) {
    -webkit-transform: translate3d(0,200%,0);
    transform: translate3d(0,200%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(3), .bt-menu-bl ul:first-of-type li:nth-child(3) {
    -webkit-transform: translate3d(0,300%,0);
    transform: translate3d(0,300%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(4), .bt-menu-bl ul:first-of-type li:nth-child(4) {
    -webkit-transform: translate3d(0,400%,0);
    transform: translate3d(0,400%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(5), .bt-menu-bl ul:first-of-type li:nth-child(5) {
    -webkit-transform: translate3d(0,500%,0);
    transform: translate3d(0,500%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(6), .bt-menu-bl ul:first-of-type li:nth-child(6) {
    -webkit-transform: translate3d(0,600%,0);
    transform: translate3d(0,600%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(7), .bt-menu-bl ul:first-of-type li:nth-child(7) {
    -webkit-transform: translate3d(0,700%,0);
    transform: translate3d(0,700%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(8), .bt-menu-bl ul:first-of-type li:nth-child(8) {
    -webkit-transform: translate3d(0,800%,0);
    transform: translate3d(0,800%,0);
}
.bt-menu-br ul:first-of-type li:nth-child(9), .bt-menu-bl ul:first-of-type li:nth-child(9) {
    -webkit-transform: translate3d(0,900%,0);
    transform: translate3d(0,900%,0);
}
/* First menu top*/
.bt-menu-tr ul:first-of-type li:first-child, .bt-menu-tl ul:first-of-type li:first-child {
    -webkit-transform: translate3d(0,-100%,0);
    transform: translate3d(0,-100%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(2), .bt-menu-tl ul:first-of-type li:nth-child(2) {
    -webkit-transform: translate3d(0,-200%,0);
    transform: translate3d(0,-200%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(3), .bt-menu-tl ul:first-of-type li:nth-child(3) {
    -webkit-transform: translate3d(0,-300%,0);
    transform: translate3d(0,-300%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(4), .bt-menu-tl ul:first-of-type li:nth-child(4) {
    -webkit-transform: translate3d(0,-400%,0);
    transform: translate3d(0,-400%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(5), .bt-menu-tl ul:first-of-type li:nth-child(5) {
    -webkit-transform: translate3d(0,-500%,0);
    transform: translate3d(0,-500%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(6), .bt-menu-tl ul:first-of-type li:nth-child(6) {
    -webkit-transform: translate3d(0,-600%,0);
    transform: translate3d(0,-600%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(7), .bt-menu-tl ul:first-of-type li:nth-child(7) {
    -webkit-transform: translate3d(0,-700%,0);
    transform: translate3d(0,-700%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(8), .bt-menu-tl ul:first-of-type li:nth-child(8) {
    -webkit-transform: translate3d(0,-800%,0);
    transform: translate3d(0,-800%,0);
}
.bt-menu-tr ul:first-of-type li:nth-child(9), .bt-menu-tl ul:first-of-type li:nth-child(9) {
    -webkit-transform: translate3d(0,-900%,0);
    transform: translate3d(0,-900%,0);
}
/* Second menu right*/
.bt-menu-br ul:nth-of-type(2) li:first-child, .bt-menu-tr ul:nth-of-type(2) li:first-child {
    -webkit-transform: translate3d(100%,0,0);
    transform: translate3d(100%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(2), .bt-menu-tr ul:nth-of-type(2) li:nth-child(2) {
    -webkit-transform: translate3d(200%,0,0);
    transform: translate3d(200%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(3), .bt-menu-tr ul:nth-of-type(2) li:nth-child(3) {
    -webkit-transform: translate3d(300%,0,0);
    transform: translate3d(300%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(4), .bt-menu-tr ul:nth-of-type(2) li:nth-child(4) {
    -webkit-transform: translate3d(400%,0,0);
    transform: translate3d(400%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(5), .bt-menu-tr ul:nth-of-type(2) li:nth-child(5) {
    -webkit-transform: translate3d(500%,0,0);
    transform: translate3d(500%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(6), .bt-menu-tr ul:nth-of-type(2) li:nth-child(6) {
    -webkit-transform: translate3d(600%,0,0);
    transform: translate3d(600%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(7), .bt-menu-tr ul:nth-of-type(2) li:nth-child(7) {
    -webkit-transform: translate3d(700%,0,0);
    transform: translate3d(700%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(8), .bt-menu-tr ul:nth-of-type(2) li:nth-child(8) {
    -webkit-transform: translate3d(800%,0,0);
    transform: translate3d(800%,0,0);
}
.bt-menu-br ul:nth-of-type(2) li:nth-child(9), .bt-menu-tr ul:nth-of-type(2) li:nth-child(9) {
    -webkit-transform: translate3d(900%,0,0);
    transform: translate3d(900%,0,0);
}
/* Second menu left*/
.bt-menu-bl ul:nth-of-type(2) li:first-child, .bt-menu-tl ul:nth-of-type(2) li:first-child {
    -webkit-transform: translate3d(-100%,0,0);
    transform: translate3d(-100%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(2), .bt-menu-tl ul:nth-of-type(2) li:nth-child(2) {
    -webkit-transform: translate3d(-200%,0,0);
    transform: translate3d(-200%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(3), .bt-menu-tl ul:nth-of-type(2) li:nth-child(3) {
    -webkit-transform: translate3d(-300%,0,0);
    transform: translate3d(-300%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(4), .bt-menu-tl ul:nth-of-type(2) li:nth-child(4) {
    -webkit-transform: translate3d(-400%,0,0);
    transform: translate3d(-400%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(5), .bt-menu-tl ul:nth-of-type(2) li:nth-child(5) {
    -webkit-transform: translate3d(-500%,0,0);
    transform: translate3d(-500%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(6), .bt-menu-tl ul:nth-of-type(2) li:nth-child(6) {
    -webkit-transform: translate3d(-600%,0,0);
    transform: translate3d(-600%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(7), .bt-menu-tl ul:nth-of-type(2) li:nth-child(7) {
    -webkit-transform: translate3d(-700%,0,0);
    transform: translate3d(-700%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(8), .bt-menu-tl ul:nth-of-type(2) li:nth-child(8) {
    -webkit-transform: translate3d(-800%,0,0);
    transform: translate3d(-800%,0,0);
}
.bt-menu-bl ul:nth-of-type(2) li:nth-child(9), .bt-menu-tl ul:nth-of-type(2) li:nth-child(9) {
    -webkit-transform: translate3d(-900%,0,0);
    transform: translate3d(-900%,0,0);
}
.bt-menu.bt-menu-open ul:first-of-type li, .bt-menu.bt-menu-open ul:nth-of-type(2) li {
    visibility: visible;
    opacity: 1;
    -webkit-transition: -webkit-transform 0.3s, opacity 0.3s 0.1s;
    transition: transform 0.3s, opacity 0.3s;
    -webkit-transform: translate3d(0,0,0);
    transform: translate3d(0,0,0);
}
.bt-menu ul li a {
    display: block;
    outline: none;
    color: transparent;
    text-align: center;
    text-decoration: none;
    font-size: 0;
}
.bt-menu ul li a:before {
    -webkit-transition: opacity 0.2s;
    transition: opacity 0.2s;
}
/********************************** Tooltips **********************************/
.bt-menu em {
    position: absolute;
    top: -9999px;
    left: -9999px;
    padding: 4px 8px;
    font-style: normal;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.5s;
    -o-transition: opacity 0.5s;
    -moz-transition: opacity 0.5s;
    -webkit-transition: opacity 0.5s;
}
.bt-menu li:hover em {
    opacity: 1;
}
.bt-menu li:hover .tl {
    top: 100%;
    left: 21px;
    margin-top: 7px;
}
.bt-menu li:hover .tr {
    top: 100%;
    right: 21px;
    left: auto;
    margin-top: 7px;
}
.bt-menu li:hover .r {
    top: 50%;
    left: 100%;
    margin-top: -11px;
    margin-left: 7px;
}
.bt-menu li:hover .br {
    top: auto;
    right: 21px;
    bottom: 100%;
    left: auto;
    margin-bottom: 7px;
}
.bt-menu li:hover .bl {
    top: auto;
    bottom: 100%;
    left: 21px;
    margin-bottom: 7px;
}
.bt-menu li:hover .l {
    top: 50%;
    right: 100%;
    left: auto;
    margin-top: -11px;
    margin-right: 7px;
}
@media screen and (max-height: 31.125em) {
    .bt-menu ul li a:before {
        font-size: 32px;
    }
    .bt-menu ul:first-of-type li {
        height: 60px;
        line-height: 60px;
    }
    .bt-menu ul:nth-of-type(2) li {
        width: 60px;
    }
}