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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              .sb-app-wrapper
  .sb-app-header header
  .sb-app-body
    - 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;
}
            
          
!
            
              // https://sebastianbourges.com/creating-a-chat-ui-with-flexbox/
// https://codepen.io/sebastianbourges/pen/vKgLjb
            
          
!
999px

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