set all tags to border-box box-sizing code example
Example 1: box sizing border box
*{
box-sizing: border-box;
}
Example 2: box-sizing border-box vs content-box css
box-sizing:content-box;
"Default. The width and height properties (and min/max properties) includes only the content. Border and padding are not included"
box-sizing:border-box;
"The width and height properties (and min/max properties) includes content, padding and border"