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the first question is whether the default font height is 1 pixel or 2 pixel, so it is misaligned. You can add a font-size:0 to div and align it without positioning.
the second one is that the background color of your box is pressed on by the back elements, leaving a background color.
because input is an inline element, there is a default vertical-align , which is caused by vertical-align .
after you use the location, you will not be affected by the surrounding elements, eliminating the influence of vertical-align
there are many ways to eliminate the influence of vertical-align . For more information, please see the following reference article
reference article
CSS deeply understands the gay relationship between vertical-align and line-height
10.8Line height calculations: the 'line-height' and' vertical-align' properties
summarize your answers
@ XYShaoKang
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