Below is the code for page header containing a logo image, 6 buttons and a search box. I was trying to implement collapsible class of Bootstrap and failed to do so. I want to arrange every element in header below each other in a column in small screens. Below is the code for page header containing a
阅读背景：
可折叠标题菜单或在小屏幕下排列另一个下方的按钮
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