如何使固定高度容器内的侧边栏与内容区垂直填充空间？

只需调整两处CSS设置即可实现需求：

• 修改.projects-content的align-items属性，将flex-start改为stretch，让子元素自动拉伸填充父容器垂直空间
• （可选）若需sidebar内部元素垂直分布，可给.sidebar添加justify-content属性（比如space-between），充分利用空间

修改后的完整代码 #

CSS

* {
  font-family: "Poppins", sans-serif;
}

body {
  background-size: 100%;
  /*background-image: url('./images/diego-ph-5LOhydOtTKU-unsplash.jpg');*/
  background-color: black;
  background-repeat: "no-repeat";
  background-position: 0 0;
  color: aliceblue;
  margin: 0;
  padding: 0;
}

.projects-table {
  border-style: solid;
  border-radius: 1rem;
  border-width: 0.25rem;
  border-color: slategrey;
  margin-top: 5rem;
  padding: 1rem;
  height: 20rem;
  display: flex;
  flex-direction: column;
}

.projects-table .search {
  opacity: 0.25;
  color: white;
  display: flex;
  flex-direction: row;
  justify-content: start;
  align-items: center;
  border-bottom: solid;
  border-width: 0.1rem;
}

.projects-table .search img {
  width: 1.25rem;
  height: 1.25rem;
  margin-right: 0.25rem;
}

.projects-table .projects-content {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  /* 修改此处：将flex-start改为stretch */
  align-items: stretch;
  margin-top: 1rem;
  flex-grow: 1;
  border-style: solid;
}

.projects-table .projects-content .sidebar {
  width: 10%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  /* 可选：添加justify-content让内部元素垂直分布 */
  justify-content: space-between;
  border-style: solid;
  margin: 0.5rem;
}

.projects-table .projects-content .sidebar p {
  border-style: solid;
  border-width: 0.1rem;
  border-radius: 0.5rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
  padding: 1rem;
}

.projects-table .projects-content .content {
  width: 100%;
  height: 100%;
  margin: 0.5rem 1rem 0.5rem 1rem;
  border-style: solid;
  border-width: 0.1rem;
  border-radius: 0.5rem;
  padding: 1rem;
}

HTML

<div class="projects-table">
      <div class="search">
        <h3>Search...</h3>
      </div>
      <div class="projects-content">
        <div class="sidebar">
          <p>Sidebar</p>
          <p>Sidebar</p>
        </div>
        <p class="content">content</p>
      </div>
    </div>

内容的提问来源于stack exchange，提问作者Anya