.container { display: grid; grid-template-columns: 200px 1fr; grid-template-rows: 100vh; } .sidebar { background-color: #f0f0f0; } .boxes { display: flex; flex-direction: column; justify-content: space-between; height: 100%; } .box { flex-grow: 1; /* 平分宽度 */ background-color: #ccc; margin-bottom: 10px; } .box:nth-child(n+3) { border-radius: 10px; margin-top: 10px; margin-left: 20px; } <div class="container"> <div class="sidebar"> </div> <div class="boxes"> <div class="box"></div> <div class="box"></div> <div class="box"></div> <div class="box"> <div class="boxSon"></div> <div class="boxSon"></div> <div class="boxSon"></div> </div> <div class="box"></div> </div> </div>补全代码将右侧第四个盒子分割为三个子盒子 要求子盒子高度等于父盒子,宽度将父盒子不均等分,且三个子盒子有一定间距

可以将右侧第四个盒子设置为 display: flex，并在其中嵌套三个子盒子，然后给父盒子设置 margin-left: 20px，再给子盒子设置 flex-grow: 1 和 margin-right: 20px 即可实现要求。

修改后的代码如下：

.container {
  display: grid;
  grid-template-columns: 200px 1fr;
  grid-template-rows: 100vh;
}

.sidebar {
  background-color: #f0f0f0;
}

.boxes {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.box {
  flex-grow: 1;
  background-color: #ccc;
  margin-bottom: 10px;
}

.box:nth-child(n+3) {
  border-radius: 10px;
  margin-top: 10px;
  margin-left: 20px;
}

.box:nth-child(4) {
  display: flex;
  margin-left: 20px;
}

.boxSon {
  flex-grow: 1;
  background-color: #ccc;
  margin-right: 20px;
}

.boxSon:last-child {
  margin-right: 0;
}

HTML代码：

<div class="container">
  <div class="sidebar"></div>
  <div class="boxes">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
    <div class="box">
      <div class="boxSon"></div>
      <div class="boxSon"></div>
      <div class="boxSon"></div>
    </div>
    <div class="box"></div>
  </div>
</div>