:root{--sidebar-width:256px}body{margin:0;display:flex;flex-direction:column;min-height:100vh}.main-content{margin-left:var(--sidebar-width);width:calc(100% - var(--sidebar-width));transition:margin-left .3s ease,width .3s ease;min-height:100vh;flex:1 1}.main-content.no-sidebar{margin-left:0;width:100%}