为什么我看不到滚动条的底部

我的滚动条底部有问题，我没有向下箭头。

我还添加了overflow-y：scroll！important;

http://jsfiddle.net/nzguLb3k/

的HTML

<div class="first">
    <p>
        CSS image replacement is a technique of replacing a text element (usually a header tag like an <h1></h1>) with an image (often a logo). It has its origins in the time before web fonts and SVG. For years, web developers battled against browser inconsistencies to craft image replacement techniques that struck the right balance between design and accessibility.

Now that web fonts and SVG do much more of the heavy lifting for stylized text on the web, these techniques are falling out of use. But, we feel it's worth preserving them in this museum to celebrate the ingenuity that went into their creation, and to remind ourselves of a bygone era in web design.
        CSS image replacement is a technique of replacing a text element (usually a header tag like an <h1></h1>) with an image (often a logo). It has its origins in the time before web fonts and SVG. For years, web developers battled against browser inconsistencies to craft image replacement techniques that struck the right balance between design and accessibility.

Now that web fonts and SVG do much more of the heavy lifting for stylized text on the web, these techniques are falling out of use. But, we feel it's worth preserving them in this museum to celebrate the ingenuity that went into their creation, and to remind ourselves of a bygone era in web design.
    </p>

</div>
<div class="second">
   Now that web fonts and SVG do much more of the heavy lifting for stylized text on the web, these techniques are falling out of use. But, we feel it's worth preserving them in this museum to celebrate the ingenuity that went into their creation, and to remind ourselves of a bygone era in web design.
</div>

的CSS

.first{
    display:inline-block;
    vertical-align:top;
    width:100px;
    height:1000px;
    overflow-y:scroll !important;
}
.second{
    margin-left:100px;
    display:inline-block;
    vertical-align:top;
     width:100px;
    height:100px;
}
body{
overflow-y:hidden;
}