当柔性盒内容垂直中心时，如何修复滚动？

Question

我想要实现的是，当视口比内容高时，内容应该垂直中心。当视口不够高且内容溢出时，父控件应该提供垂直滚动条。

当我将柔性盒内容与中间对齐，并将内容设置为滚动时，它不仅会忽略内容边距，而且会在顶部截断(给定的视口比内容短)。有办法解决这个问题吗？

​

html, body {
    height: 100%;
}
body {
    display: flex;
    flex-wrap: nowrap;
    flex-direction: row;
    overflow: hidden;
}
.container {
    overflow-y: auto;
    display: flex;
    flex-wrap: nowrap;
    flex-direction: row;
    align-items: center;
}

.content {
    border: 1px solid grey;
    background-color: lightgrey;
    padding: 10px;
    margin: 10px;
    border-radius: 10px;
}

<div class="container">
    <div class="content">
        Start of the content
        <br />
        <br />
        Middle of the content
        <br />
        <br />
        End of the content
    </div>
</div>
<div class="container">
    <div class="content">
        Start of the content :(((
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        Middle of the content
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        End of the content
    </div>
</div>

​

Answer 1

align-items: safe center应该避免孩子们越界。

https://developer.mozilla.org/en-US/docs/Web/CSS/align-items

安全

与对齐关键字一起使用。如果选择的关键字意味着项溢出导致数据丢失的对齐容器，则项目将被对齐，就好像对齐模式已经启动一样。

​

html, body {
    height: 100%;
}
body {
    display: flex;
    flex-wrap: nowrap;
    flex-direction: row;
    overflow: hidden;
}
.container {
    overflow-y: auto;
    display: flex;
    flex-wrap: nowrap;
    flex-direction: row;
    align-items: safe center;
}

.content {
    border: 1px solid grey;
    background-color: lightgrey;
    padding: 10px;
    margin: 10px;
    border-radius: 10px;
}

<div class="container">
    <div class="content">
        Start of the content
        <br />
        <br />
        Middle of the content
        <br />
        <br />
        End of the content
    </div>
</div>
<div class="container">
    <div class="content">
        Start of the content :(((
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        Middle of the content
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        End of the content
    </div>
</div>

​

如果浏览器在对齐时不支持安全/不安全的关键字，则可以使用自动页边距：

​

html, body {
    height: 100%;
}
body {
    display: flex;
    flex-wrap: nowrap;
    flex-direction: row;
    overflow: hidden;
}
.container {
    overflow-y: auto;
    display: flex;
    flex-wrap: nowrap;
    flex-direction: row; 
    padding:10px 0;
}

.content {
    border: 1px solid grey;
    background-color: lightgrey;
    padding: 10px;
    margin:auto 10px;
    border-radius: 10px;
}

<div class="container">
    <div class="content">
        Start of the content
        <br />
        <br />
        Middle of the content
        <br />
        <br />
        End of the content
    </div>
</div>
<div class="container">
    <div class="content">
        Start of the content :(((
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        Middle of the content
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        End of the content
    </div>
</div>

​