.back-to-top{align-items:center;border-radius:50%;bottom:px;box-shadow:0 4px 12px rgba(0,0,0,.15);cursor:pointer;display:flex;height:px;justify-content:center;opacity:0;position:fixed;right:px;transform:translateY(10px);transition:opacity .3s ease,visibility .3s ease,transform .3s ease;visibility:hidden;width:px;z-index:999}.back-to-top.show{opacity:1;transform:translateY(0);visibility:visible}.back-to-top:hover{opacity:.9;transform:translateY(-3px)}.back-to-top__icon{font-size:calc(px / 2);line-height:1}
43:3	⚠  Lexical error on line 1: Unrecognized text.

  Erroneous area:
1: px / 2
^..^ [postcss-calc]