要做到这一点，最简单的方法就是假装。《A List Apart》多年来对此进行了广泛的报道，比如Dan Cederholm 2004年的一篇文章。

我通常是这样做的:

<div id="container" class="clearfix" style="margin:0 auto;width:950px;background:white url(SOME_REPEATING_PATTERN.png) scroll repeat-y center top;">
    <div id="navigation" style="float:left;width:190px;padding-right:10px;">
        <!-- Navigation -->
    </div>
    <div id="content" style="float:left;width:750px;">
        <!-- Content -->
    </div>
</div>

您可以通过将#container包装在另一个div中，将标题div嵌入为#container的兄弟，并将边缘和宽度样式移动到父容器中，轻松地在此设计中添加标题。此外，CSS应该移动到一个单独的文件，而不是保持内联等等。最后，clearfix类可以在positioniseverything上找到。

2021年的读者:

试试这个:

.parent {
  position: relative;

  display: flex;                 // And you will probably need this too.
  flex-direction: row;           // or column.
}

.child {
  position: absolute;
  top: 0;
  bottom: 0;

  align-self: center;            // And you will probably need this too.
}

以下是我正在做的事情:

我发现，设置两列显示:table-cell;代替float: left;工作得很好。

下面的代码提供了设置滚动div的最小高度的能力，并通过使用flex使其具有其父div的100%高度。

CSS:

.main {
  display: flex;
  flex-direction: column;
}

.scroll {
  overflow: auto;
  flex: 1 0 50px;
}

HTML:

<div class="main">
  <div class="scroll">
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
  </div>
</div>

使用jQuery:

$(function() {
    function unifyHeights() {
        var maxHeight = 0;
        $('#container').children('#navigation, #content').each(function() {
            var height = $(this).outerHeight();
            // alert(height);
            if ( height > maxHeight ) {
                maxHeight = height;
            }
        });
        $('#navigation, #content').css('height', maxHeight);
    }
    unifyHeights();
});

我有同样的问题，它的工作基于Hakam Fostok的答案，我已经创建了一个小例子，在某些情况下，它可能不需要添加显示:flex;而弯曲方向:圆柱;在父容器上

.row {
    margin-top: 20px;
}

.col {
    box-sizing: border-box;
    border: solid 1px #6c757d;
    padding: 10px;
}

.card {
    background-color: #a0a0a0;
    height: 100%;
}

JSFiddle