tr { background: #ececec ; display:flex; margin-bottom: .2em; width: 100%;}
td { margin: 1em; display:inline-block;background:white;  flex: 1;}

tr:nth-of-type(3){ background:hsla(200,20%,80%,.9); margin-bottom: 2em; }

h3 { background: maroon;color:white;padding: 1em;}

.note {
  font-style: italic;
  width:60%;
  margin-left: 20%;
  background: lemonchiffon;
}

table {
  border: 1px solid;
}

body { display:grid; grid-template: 1fr / repeat(2, 1fr)  } 
h3 {grid-column: 1 / -1; }