CSS-页脚位于底部，内容位于页眉和页脚之间

Question

* {
  box-sizing: border-box;
}

.wrapper {
  max-width: 1024px;
  margin: 0 auto;
  font: 1.2em Helvetica, arial, sans-serif;
}

.wrapper>* {
  border: 2px solid #f08c00;
  background-color: #ffec99;
  border-radius: 5px;
  padding: 10px;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.wrapper {
  display: grid;
  grid-template-columns: repeat(12, [col-start] 1fr);
  grid-gap: 20px;
}

.wrapper>* {
  grid-column: col-start / span 12;
}

@media (min-width: 500px) {
  .side {
    grid-column: col-start / span 3;
    grid-row: 3;
  }
  .ad {
    grid-column: col-start / span 3;
    grid-row: 4;
  }
  .content,
  .main-footer {
    grid-column: col-start 4 / span 9;
  }
  nav ul {
    display: flex;
    justify-content: space-between;
  }
}

@media (min-width: 700px) {
  .main-nav {
    grid-column: col-start / span 2;
    grid-row: 2 / 4;
  }
  .content {
    grid-column: col-start 3 / span 8;
    grid-row: 2 / 4;
  }
  .side {
    grid-column: col-start 11 / span 2;
    grid-row: 2;
  }
  .ad {
    grid-column: col-start 11 / span 2;
    grid-row: 3;
  }
  .main-footer {
    grid-column: col-start / span 12;
  }
  nav ul {
    flex-direction: column;
  }
}

<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout/Realizing_common_layouts_using_CSS_Grid_Layout -->

<div class="wrapper">
  <header class="main-head">The header</header>
  <nav class="main-nav">
    <ul>
      <li><a href="">Nav 1</a></li>
      <li><a href="">Nav 2</a></li>
      <li><a href="">Nav 3</a></li>
    </ul>
  </nav>
  <article class="content">
    <h1>Main article area</h1>
    <p>In this layout, we display the areas in source order for any screen less that 500 pixels wide. We go to a two column layout, and then to a three column layout by redefining the grid, and the placement of items on the grid.</p>
  </article>
  <aside class="side">Sidebar</aside>
  <div class="ad">Advertising</div>
  <footer class="main-footer">The footer</footer>
</div>

Here's an example from mozilla doc.

如何使页脚始终停留在页面底部（无论视口如何）

如何使页眉和页脚之间的内容覆盖整个剩余区域（无论视口如何）。基本上，我如何确保黑白的页眉+页脚+内容（和边距）覆盖100％的高度？

最后一个问题，我想通过自举实现相同的目的。是否有任何引导程序模板使用其类来做到这一点？ （响应能力很重要）。

p.s。学习html / css，因此对您的解决方案的工作原理进行一些解释将非常有帮助。

Answer 1

将width: 100vw;和height: 100vh;添加到包装中，它将拉伸。我还添加了

html, body{
  margin: 0;
}

由于100vw未考虑正文的边距，因此您必须将其设置为0。

* {
  box-sizing: border-box;
}

html, body{
  margin: 0;
}


.wrapper {
  max-width: 1024px;
  margin: 0 auto;
  font: 1.2em Helvetica, arial, sans-serif;
  width: 100vw; 
  height: 100vh;
}

.wrapper>* {
  border: 2px solid #f08c00;
  background-color: #ffec99;
  border-radius: 5px;
  padding: 10px;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.wrapper {
  display: grid;
  grid-template-columns: repeat(12, [col-start] 1fr);
  grid-template-rows: 50px auto auto 50px;
  grid-gap: 20px;
}

.wrapper>* {
  grid-column: col-start / span 12;
}

@media (min-width: 500px) {
  .side {
    grid-column: col-start / span 3;
    grid-row: 3;
  }
  .ad {
    grid-column: col-start / span 3;
    grid-row: 4;
  }
  .content,
  .main-footer {
    grid-column: col-start 4 / span 9;
  }
  nav ul {
    display: flex;
    justify-content: space-between;
  }
}

@media (min-width: 700px) {
  .main-nav {
    grid-column: col-start / span 2;
    grid-row: 2 / 4;
  }
  .content {
    grid-column: col-start 3 / span 8;
    grid-row: 2 / 4;
  }
  .side {
    grid-column: col-start 11 / span 2;
    grid-row: 2;
  }
  .ad {
    grid-column: col-start 11 / span 2;
    grid-row: 3;
  }
  .main-footer {
    grid-column: col-start / span 12;
  }
  nav ul {
    flex-direction: column;
  }
}

<div class="wrapper">
  <header class="main-head">The header</header>
  <nav class="main-nav">
    <ul>
      <li><a href="">Nav 1</a></li>
      <li><a href="">Nav 2</a></li>
      <li><a href="">Nav 3</a></li>
    </ul>
  </nav>
  <article class="content">
    <h1>Main article area</h1>
    <p>In this layout, we display the areas in source order for any screen less that 500 pixels wide. We go to a two column layout, and then to a three column layout by redefining the grid, and the placement of items on the grid.</p>
  </article>
  <aside class="side">Sidebar</aside>
  <div class="ad">Advertising</div>
  <footer class="main-footer">The footer</footer>
</div>