How to position the fixed menu on the left and the content block on the right_html/css_WEB-ITnose

The fixed menu on the left is fixed on the left, and the up and down movement is fixed. The content block is on the right. How to achieve positioning?
As shown in the picture

Reply to the discussion (solution)

This is the right block

The left block

< /div>

Sorry, I didn’t make it clear. The effects of the above pictures are piled together, so I want to separate them as shown below:

Please help me take a look , the positioning is always bad, thank you

If it doesn’t work, you can use positioning.
Website layout, nothing difficult.

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