如果鼠标在固定块上方,则滚动不起作用

Scroll don't work, if mouse above fixed block

我有问题。如果我的鼠标位于该块上方,则页面上的固定块会阻止滚动。 我的例子:

body {
    overflow: hidden;
    padding: 0;
    margin: 0;
}
.body_block {
    display:block;
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: #e0e0e0;
    overflow: hidden;
}
.menu {
    display: block;
    width: 100px;
    height: 200px;
    background-color: #ffdd56;
    position: fixed;
    top: 0;
    right: 0;
    z-index: 3;
}
.content {
    display: block;
    position: relative;
    top: 0;
    left: 0;
    background-color: #a9eceb;
    width: 100%;
    height: 100%;
    z-index: 2;
    overflow: scroll;
}

http://jsfiddle.net/u6b42vsq/1/

这是工作 fiddle:http://jsfiddle.net/u6b42vsq/4/ 这是最后的 css:

body {
    padding: 0;
    margin: 0;
}
.body_block {
    display:block;
    position: absolute;
    width: 100%;
    background-color: #e0e0e0;
    overflow: hidden;
}
.menu {
    display: block;
    width: 100px;
    height: 200px;
    background-color: #ffdd56;
    position: fixed;
    top: 0;
    right: 0;
    z-index: 3;
}
.content {
    display: block;
    position: relative;
    top: 0;
    left: 0;
    background-color: #a9eceb;
    width: 100%;
    height: 100%;
    z-index: 2;
}