@media (min-width: 992px){.header{position:fixed;transition:transform .3s cubic-bezier(.785,.135,.15,.86);width:100%;z-index:99;top:0}.header.is-hidden{transform:translateY(-110%)}main{margin-top:140px}}.btn-back-to-top{visibility:hidden;opacity:0;transition:opacity .6s cubic-bezier(.785,.135,.15,.86)}.btn-back-to-top.show{visibility:visible;opacity:1}