From Meta, a Wikimedia project coordination wiki
.cronos-day-heading {
width: 99%;
}
.cronos-day-heading-section {
box-shadow:0 2px 2px 0 rgba(0,0,0,0.14),0 3px 1px -2px rgba(0,0,0,0.12),0 1px 5px 0 rgba(0,0,0,0.2);
background:#069;
background: rgba(0, 102, 153, 0.5);
padding:1em;
border-radius: 15px 15px 0 0;
}