Detailed explanation of CSS web page layout misalignment width calculation instructions

Why calculate the width
Calculating the pixel width of the web page is to CSSThe web page layout is neat and compatible. It is common for us to calculate the width of the entire page when we lay out the left and right structural web pages or use padding, margin layout. If we do not calculate the width, no matter whether the width is too large or too small, misalignment problems will occur.

How to calculate CSS width
Example 1: We calculate the layout style of a left and right structure.
If the total width is 400px, then the sum of the left and right should be less than 400px, then we may have 300px on the left and 100px on the right
Correct code:

head>

300px on the left

100px on the right

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