.lp-header-section .lp-header-btn a{overflow:hidden;position:relative;z-index:1}.lp-header-section .lp-header-btn a:before{background:#000;content:" ";height:100%;left:0;position:absolute;top:0;transition:all .4s;width:0;z-index:-1}.lp-header-section .lp-header-btn a:hover:before{width:100%}