使用网格布局来实现左侧浏览器的固定位置疑惑？

Question

最近研究网格布局，layout in this image，我自己的实现如下：

body,
html {
  margin: 0px;
  padding: 0px;
  height: 100%;
}

header,
footer {
  background-color: #999;
  text-align: center;
  padding: 10px;
  color: #fff;
}

header {
  grid-column: 1 / 5;
}

footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  height: 30px;
}

.container {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  display: grid;
  /*   display: inline-grid; */
  grid-template-rows: 1fr;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 15px 20px;
  grid-template-areas: "m b i t" "m s s s" "m c c c";
}

.item-1 {
  background-color: aquamarine;
  height: 100vh;
  left: 0px;
  grid-area: m;
}

.item-2 {
  background-color: coral;
  grid-area: b;
  height: 120px;
  margin-top: 10px;
}

.item-3 {
  background-color: beige;
  grid-area: i;
  height: 120px;
  margin-top: 10px;
}

.item-4 {
  background-color: darkturquoise;
  grid-area: t;
  margin-top: 10px;
}

.item-5 {
  background-color: darkgray;
  grid-area: s;
}

.item-6 {
  background-color: darkcyan;
  grid-area: c;
  padding-bottom: 50px;
}

<div>
  <header class="header">this is header</header>
  <div class="container">
    <div class="item-1">clo 1</div>
    <div class="item-2">col 2</div>
    <div class="item-3">col 3</div>
    <div class="item-4">col 4</div>
    <div class="item-5">
      <h2>this is 44</h2>
    </div>
    <div class="item-6">
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
    </div>
  </div>
  <footer>this is footer</footer>
</div>

但是，我现在遇到了一个问题，我已经努力冥想了几天。我无法理解为什么，我希望每个人都可以提供帮助：

对于左侧的item1，是固定屏幕高度和浏览器高度的固定效果，但如果我使用grid做布局，就没有办法实现左边的固定效果，如何解决呢？ （由于响应式布局，在屏幕小于特定大小后将隐藏item1，并将显示menu按钮）

非常感谢您解决任何疑问的任何帮助

Answer 1

你可以使用position: sticky而不是fixed。

body,
html {
  margin: 0px;
  padding: 0px;
  height: 100%;
}

header,
footer {
  background-color: #999;
  text-align: center;
  padding: 10px;
  color: #fff;
}

header {
  grid-column: 1 / 5;
}

footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  height: 30px;
}

.container {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  display: grid;
  /*   display: inline-grid; */
  grid-template-rows: 1fr;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 15px 20px;
  grid-template-areas: "m b i t" "m s s s" "m c c c";
}

.item-1 {
  background-color: aquamarine;
  height: 100vh;
  left: 0px;
  grid-area: m;
  /* added */
  position: sticky;
  top: 0;
}

.item-2 {
  background-color: coral;
  grid-area: b;
  height: 120px;
  margin-top: 10px;
}

.item-3 {
  background-color: beige;
  grid-area: i;
  height: 120px;
  margin-top: 10px;
}

.item-4 {
  background-color: darkturquoise;
  grid-area: t;
  margin-top: 10px;
}

.item-5 {
  background-color: darkgray;
  grid-area: s;
}

.item-6 {
  background-color: darkcyan;
  grid-area: c;
  padding-bottom: 50px;
}

<div>
  <header class="header">this is header</header>
  <div class="container">
    <div class="item-1">clo 1</div>
    <div class="item-2">col 2</div>
    <div class="item-3">col 3</div>
    <div class="item-4">col 4</div>
    <div class="item-5">
      <h2>this is 44</h2>
    </div>
    <div class="item-6">
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
      <h1>123123</h1>
    </div>
  </div>
  <footer>this is footer</footer>
</div>