<div class="yoho-suggest-sub-page yoho-page">
    <div class="suggest-sub-form">
        <textarea name="" id="suggest-textarea" placeholder="请写下对于BLK的意见和建议，我们将及时根据您的意见作出改进"></textarea>
    </div>
</div>
<style>
    html,
    body {
        height: 100%;
    }

    .main-wrap {
        height: 100%;
    }
</style>