.bslib-sidebar-layout>.sidebar>.sidebar-content { display: flex; flex-direction: column; padding: 1.5rem; } .bslib-sidebar-layout>.main { grid-column: 2 / 3; border-top-left-radius: 0; border-bottom-left-radius: 0; padding: 1.5rem; } .shiny-notification { position:fixed; top: calc(0%); left: calc(50% - 150px); }