/*  
---------------------------------------------------
Back to top - Large Breakpoint
---------------------------------------------------  
*/

.usn_back-to-top { 
    position:fixed; 
    bottom: calc((var(--backtotop-size_lg) + var(--base-half-spacing)) * -1); z-index:903;
    width: var(--backtotop-size_lg); height: var(--backtotop-size_lg);
    border-radius: var(--btn-border-radius);
    
    /* Safari OSX, iOS performance improvements */ 
    will-change: transform, bottom;
}

html.nav-down:not(.reached-top) .usn_back-to-top,
html.nav-up .usn_back-to-top {
    bottom: calc(var(--backtotop-spacing_below_lg) + (var(--btn-border-width) * 2));
}

.usn_back-to-top a.btn { 
    font-size:25px; 
    width:var(--backtotop-size_lg); height:var(--backtotop-size_lg);
}

.usn_back-to-top.position-left {
    left: var(--backtotop-spacing_side_lg);
}
.usn_back-to-top.position-center {
    left: 50%; 
    transform:translateX(-50%);
}
.usn_back-to-top.position-right {
    right: var(--backtotop-spacing_side_lg);
}