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  .sb-app-header header
    - for (var i = 0; i < 12; ++i)
      .box(class='type'+ i) box
  .sb-app-footer footer


                html, body { // resets
  height: 100%; // vertical height fills viewport
.sb-app-wrapper { // flex container
  display: flex; // make flex container
  flex-direction: column; // set it to vertical column
  height: 100%; // so that it extends full height
.sb-app-header { // flex item
  background: pink;
  flex-shrink:0; // don't let the header shrink
  height: 3em; // set the height of the header
.sb-app-body { // flex item
  flex: 1; // make the body area take up any extra vertical space
  overflow: auto; // make body area scrollable
.sb-app-footer { // flex item
  background: green;
  flex-shrink: 0; // don't let the footer shrink
  height: 3em; // set the height of the footer

// resets
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0;
// demo content
.box {
  color: white;
  background: gray;
  margin: 1em;
  height: 10em;