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                <div class="full-screen">
  <div class="header"></div>
  <div class="content">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eligendi, voluptatibus odio? Obcaecati neque nesciunt officiis nulla iusto veritatis, quas mollitia provident, ullam optio possimus ducimus perspiciatis magnam ab et excepturi.
    Lorem ipsum dolor sit amet consectetur adipisicing elit. Vel cumque sint ea veritatis deserunt totam nam officia est facere id repellendus, ab tenetur laudantium beatae hic laborum ducimus, quibusdam quos?
  <div class="footer"></div>


                body {margin: 0;}

.full-screen {
  background: pink;
  font-size: 42px;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;

.content {
  padding: 16px;
  flex-grow: 1;
  overflow: auto;

.header {
  height: 50px;
  flex-shrink: 0;
  background: blue;

.footer {
  height: 50px;
  flex-shrink: 0;
  background: green;