Не отображается рамка

<div class="site_content">

<div class="sidebar_conteiner">

<div class="sidebar">

<h2>Поиск</h2>
<form method="post" action="#" id="search_form">
<input type="search" name="search_field" placeholder="ваш запрос">
<input type="submit" class="btn" value="найти" />
</form>

CSS

.site_content {
width: 480px;
overflow:hidden;
margin: 20px auto 0 auto;
background-color:white;
}

.sidebar_conteiner {
float: right;
width: 224px;
}

.sidebar {
float: right;
width: 222px;
padding: 5%;
margin: 0 0 16px 0;
border: solid 1px #f2f2f2
border-radius: 5px;
background-color: #f9f9f9;
}

.btn {
padding: 8px;
background-color: white;
cursor: pointer;
}

file:///C:/Users/kryni/Desktop/kino-hd/index.html