Firefox中奇怪的滚动侧边栏行为

Question

我正在创建一个带有滚动侧边栏的应用程序，但是当我使用Firefox时它的行为有点奇怪：如果鼠标在侧边栏中较低，侧边栏中的内容会在div的顶部稍微消失，并且会正确消失当鼠标位于侧边栏的顶部时。

这不是世界末日，但我宁愿让我的应用程序对Firefox用户不那么奇怪。

这是HTML：

<div id="header">
  <h1>Header</h1>
</div>
<div id="fixed-body">
  Test
</div>
<div id="scrollable">
  <div id="menu-header">
    Menu
  </div>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc vitae mauris in lacus vestibulum facilisis non at mauris. 
  </p> 
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc vitae mauris in lacus vestibulum facilisis non at mauris. 
  </p> 
</div>

CSS：

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

#header {
    position: fixed;
    left: 0;
    top: 0;
    height: 10%;
    width: 100%;
    background-color: #DDFFDD;
    color: #005500;
}   

h1 {
    font-size: 2em;
    margin: 0;
    padding: 5px;
  }   

  #fixed-body {
    position: fixed;
    top: 10%;
    left: 0;
    background-color: #AAAAFF;
    width: 75%;
    height: 90%;
  }   

  #scrollable {
    height: 100%;
    width: 25%;
    margin-left: 75%;
    margin-top: 10%;
    padding: 0;
    overflow-y: scroll;
  }   

  #menu-header {
    width: 90%;
    margin: 0 5%;
    padding: 3px;
    background-color: #F80;
    font-size: 1.8em;
    font-weight:bold;
  }

  p { 
    margin: 10px;
    font-size: 1.4em;
  }   

指向JSFiddle的链接：https://jsfiddle.net/threerightangles/os1b48ou/

Answer 1

尝试将overflow-y: scroll上的overflow-y: auto更改为#scrollable：

<强> External JSFiddle here

body,
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}
#header {
  position: fixed;
  left: 0;
  top: 0;
  height: 10%;
  width: 100%;
  background-color: #DDFFDD;
  color: #005500;
}
h1 {
  font-size: 2em;
  margin: 0;
  padding: 5px;
}
#fixed-body {
  position: fixed;
  top: 10%;
  left: 0;
  background-color: #AAAAFF;
  width: 75%;
  height: 90%;
}
#scrollable {
  height: 100%;
  width: 25%;
  margin-left: 75%;
  margin-top: 10%;
  padding: 0;
  overflow-y: auto;
}
#menu-header {
  width: 90%;
  margin: 0 5%;
  padding: 3px;
  background-color: #F80;
  font-size: 1.8em;
  font-weight: bold;
}
p {
  margin: 10px;
  font-size: 1.4em;
}

<div id="header">
  <h1>Header</h1>
</div>
<div id="fixed-body">
  Test
</div>
<div id="scrollable">
  <div id="menu-header">
    Menu
  </div>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc vitae mauris in lacus vestibulum facilisis non at mauris.
  </p>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc vitae mauris in lacus vestibulum facilisis non at mauris.
  </p>
</div>