Bootstrap模板，css背景颜色没有覆盖div

Question

我试图构建我的单页设计，但每当我尝试更改div的颜色时，它只会导致一个小框。

HTML：

<div class="sec1 clearfix"> 
    <div class="row"> 
     <h2 class="push_3">About Us</h2> 
     <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p> 
     <p><a class="btn btn-default" href="#" role="button">View details &raquo;</a></p> 
    </div> 
</div> 

CSS：

.sec1 { 
    height: 200px; 
    background-color: red; 
    width: 100%; 
    background-repeat: repeat; 
    display: block; 
} 

所有即时得到http://imgur.com/BADowGl

Answer 1

.sec1 { 
height: 200px; 
background-color: red; 
width: auto; 
background-repeat: repeat; 
position:absolute; 
} 
.sec1 .row{ 
    postion:relative; 
    border:1px solid red; 
    color:green; 
}