CSS control front-end style compatibility issue between 360 and chrome, begging experts for help, waiting online,,,,,,,_html/css_WEB-ITnose

The following code, without adding red fonts, is the effect of the first and second pictures in 360 and chrome respectively.
After adding red fonts, it is the third and fourth pictures respectively in 360 and chrome The effect of the picture
I just want to make a drop-down box for the search box, with the product list next to the input box above, but the effect is different in different browsers, which is frustrating