无法让列适合网格宽度

Can't get columns to fit grid width

我正在使用语义 UI,但无法正确设置网格。根据文档,Semantic UI 使用 16 列,我试图在左侧有一个宽度为 three 的列,旁边是一个宽度为 thirteen 的列.这是它的样子(图片被裁剪):

我已经使用 Bootstrap 很长时间了,现在正在尝试使用语义 UI。我错过了什么? Demo

<header>
    <div class="mobile hidden">
        <div class="ui container">
            <div class="ui grid">
                <div class="eight column">
                    <div class="ui secondary menu">
                        <a class="active item">
                            Home
                        </a>
                        <a class="item">
                            Messages
                        </a>
                        <a class="item">
                            Friends
                        </a>
                        <div class="right menu">
                            <div class="item">
                                <div class="ui icon input">
                                    <input type="text" placeholder="Search...">
                                    <i class="search link icon"></i>
                                </div>
                            </div>
                            <a class="ui item">
                                Logout
                            </a>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</header>
<div class="clearing"></div>
<div class="ui container">
    <div class="mobile hidden">
        <div class="ui grid row">
            <aside class="three column red">

            </aside>
            <section class="thirteen column olive">
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            </section>
        </div>
    </div>
</div>

您的 HTML 元素中缺少两个额外的 类 widefield。改变如下

<aside class="three wide field column red"></aside>
<section class="thirteen wide field column olive">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ab doloremque illum quas? Dolore dolorem dolorum ipsum? Commodi error excepturi laboriosam magnam nobis odio suscipit unde! Alias atque dicta reiciendis sapiente!
</section>