.sidebar{overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin}.sidebar nav{flex-shrink:0}.sidebar .side-bottom{flex-shrink:0}.mail-item{padding:14px 0;border-bottom:1px solid var(--line)}.mail-item summary{cursor:pointer}.mail-item p{white-space:pre-wrap;overflow-wrap:anywhere}.member-dialog textarea{max-width:100%;width:100%;box-sizing:border-box}