.btn_book{position:relative;color:#fff;font-family:Josefin Sans;font-size:12px;letter-spacing:.05em;border:none;background-color:#1e1e1e;z-index:2;transition:all .02s ease .25s;overflow:hidden;padding:2px 5px;line-height:1em}@media (min-width:768px){.btn_book{padding:3px 0}}.btn_book:before{background:#936b1b;z-index:-1;transition:all .3s cubic-bezier(.2,.4,.4,.9)}.btn_book:after,.btn_book:before{content:"";position:absolute;left:-100%;top:0;height:100%;width:100%}.btn_book:after{background:#b58b37;z-index:-2;transition:all .4s cubic-bezier(.25,.46,.45,.94) .03s}.btn_book:hover{cursor:pointer;color:#fff}.btn_book:hover:before{left:0;width:100%;transition:all .4s cubic-bezier(.56,.08,.7,.5) .03s}.btn_book:hover:after{left:0;width:100%;transition:all .3s cubic-bezier(.56,.08,.7,.5)}