how to ensure a text entered in a form is a number on css code example

Example 1: how to write css for input type text

/* For Example, If we want to change css of "text" type
from <input> we do this:*/

input[type=text] {
    /* Your Code Here */ 
}

Example 2: css set styles for input text

input[type="text"] {  font-size: 0.9em;  padding-top: 0.35rem;}