.bt-menu,.bt-menu ul{-webkit-backface-visibility:hidden}*,::before,:after{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}body{background:#282828}.container{padding:0}.bt-menu{position:fixed;z-index:10;top:0;left:0;width:100%;height:0;border-width:0;border-style:solid;border-color:#333;background-color:rgba(0,0,0,0);-webkit-transition:border-width .3s,background-color .3s,height 0s .3s;transition:border-width .3s,background-color .3s,height 0s .3s}.bt-menu.bt-menu-open{height:100%;border-width:60px 60px 60px 90px;background-color:rgba(0,0,0,.3);-webkit-transition:border-width .3s,background-color .3s;transition:border-width .3s,background-color .3s}.bt-overlay{position:absolute;width:100%}.bt-menu-open .bt-overlay{height:100%}.bt-menu-trigger{position:fixed;top:15px;left:20px;display:block;width:50px;height:50px;cursor:pointer}.bt-menu-trigger span{position:absolute;top:50%;left:0;display:block;width:100%;height:4px;margin-top:-2px;background-color:#fff;font-size:0;-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;-webkit-transition:background-color .3s;transition:background-color .3s}.bt-menu-open .bt-menu-trigger span{background-color:transparent}.bt-menu-trigger span:after,.bt-menu-trigger span:before{position:absolute;left:0;width:100%;height:100%;background:#fff;content:'';-webkit-transition:-webkit-transform .3s;transition:transform .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;top:75px;left:0;margin:0;padding:0;width:90px;list-style:none;backface-visibility:hidden}.bt-menu ul li,.bt-menu ul li a{display:block;width:100%;text-align:center}.bt-menu ul li{padding:16px 0;opacity:0;visibility:hidden;-webkit-transition:-webkit-transform .3s,opacity .2s,visibility 0s .3s;transition:transform .3s,opacity .2s,visibility 0s .3s}.bt-menu ul li:first-child{-webkit-transform:translate3d(-100%,200%,0);transform:translate3d(-100%,200%,0)}.bt-menu ul li:nth-child(2){-webkit-transform:translate3d(-100%,100%,0);transform:translate3d(-100%,100%,0)}.bt-menu ul li:nth-child(3){-webkit-transform:translate3d(-100%,0,0);transform:translate3d(-100%,0,0)}.bt-menu ul li:nth-child(4){-webkit-transform:translate3d(-100%,-100%,0);transform:translate3d(-100%,-100%,0)}.bt-menu ul li:nth-child(5){-webkit-transform:translate3d(-100%,-200%,0);transform:translate3d(-100%,-200%,0)}.bt-menu.bt-menu-open ul li{visibility:visible;opacity:1;-webkit-transition:-webkit-transform .3s,opacity .3s .1s;transition:transform .3s,opacity .3s;-webkit-transform:translate3d(0,0,0);transform:translate3d(0,0,0)}.bt-menu ul li a{display:block;outline:0;color:transparent;text-decoration:none;font-size:0}.bt-menu ul li a:focus:before,.bt-menu ul li a:hover:before{color:#fff}