export const makeFocusButton = ( ) => { const header = document . querySelector ( 'header' ) ! ; const focusButton = header . insertBefore ( document . createElement ( 'button' ) , header . children [ 0 ] ) ; focusButton . className = 's-btn s-btn__primary' ; focusButton . style . cssText = 'position: absolute; margin-left: 10px; height: 100%; z-index: 1; display: none;' ; return focusButton ; } ;