What is CSS?

CSS stands for Cascading Style Sheets. CSS describes how HTML elements are to be displayed on screen, paper, or in other media.

CSS is a style language that defines layout of HTML documents. For example, CSS covers fonts, colours, margins, lines, height, width, background images, advanced positions and many other things.

About CSS Validate tool

This tool was created to help with debugging. Use Online CSS Validator to validate css code and find errors and warnings that can be fixed, also you can personalize your css validation from the options. Make Beautify your css code after coding is complete.

How it Works?

Just paste your CSS to the textarea above and click to the button "Validate" and you will get result of validate below in the next div-block. Also you can click to the button "Formatter" to get the Formatting(Beautify) CSS code.

Example

/* Comments */

html {
  font-family: sans-serif;
  line-height: 1.15;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

article, aside, figcaption, figure, footer, header, hgroup, main, nav, section {
  display: block;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: left;
  background-color: #fff;
}