how to color input border code example

Example 1: html input type colour internal border

input::-webkit-color-swatch {
    border: none;
}

Example 2: how to change input border color with js

document.getElementById("fName").className = document.getElementById("fName").className + " error";  // this adds the error class

document.getElementById("fName").className = document.getElementById("fName").className.replace(" error", ""); // this removes the error class