/* Each date sticks within its own group; the following date naturally replaces it. */
.sd-panel.sd-inbox-panel[data-mode="inbox"][data-center-tab="notifications"] .xwn-list > .xwn-day > h3 {
  position: sticky;
  top: 0;
  z-index: 3;
  background: #fff;
  box-shadow: 0 1px 0 #e5eaf2;
}
/* Highlight the complete message row, including its trailing actions. */
.sd-panel.sd-inbox-panel[data-mode="inbox"][data-center-tab] .xwn-list .xwn-row:hover,
.sd-panel.sd-inbox-panel[data-mode="inbox"][data-center-tab] .xwn-list .xwn-row:focus-within {
  background: #e2ecff;
}