css - L型div容器

Question

我正在尝试使用 CSS 绘制以下“L”形 div。

如何在这个 L 形容器中绘制这个包含文本流的形状？

Answer 1

像这样:

HTML:

<div class="container">
    <div class="mask"></div>
     <p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>

CSS:

.container
{
    border: 3px solid black;
}

.mask
{
    border-style: solid;
    border-width: 0 0 3px 3px;
    position: relative;
    float: right;
    clear: none;
    right: -3px;
    top: -3px;
    background-color: white;
    width: 50%;
    height: 4em;
}

Demo