I think you mean that everything moves when you open a collapsible. This is because the browser scroll bar appears and needs space, so everything else moves left about 15px.
First up you have the following, which is wrong:
Code:
<div align="center">
<body>
it should be:
Code:
<body>
<div align="center">
Now, to fix the scroll bar issue in Firefox, add the following CSS rule:
Code:
html {
overflow: -moz-scrollbars-vertical;
}
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