绝对定位模拟固定定位

*{
    margin: 0;
    padding: 0;
    list-style: none;
}

body,
html {
    height: 100%;
    overflow: hidden;
}

#content {
    height: 100%;
    overflow: auto;
}

#wrapper {
    position: absolute;
    height: 100px;
    width: 100%;
    background-color: #f00;
}

<div id="content">
        <div id="wrapper">
            
        </div>
    </div>