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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

     

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Next Step Leave tour

HTML

            
              <div id="container">
  <h1>Newsletter Signup</h1>
  <form>
    <div id="error" style="color: red;"></div>
    <input id="first-name" type="text" placeholder="First Name"><br>
    <input id="email" type="text" placeholder="Email"><br>
    <button type="button" onclick="join();">Join</button>
  </form>
</div>
!

CSS

            
              body {
  background: linear-gradient(to right, #813eab, #fe001e);
  font-family: 'Lato', sans-serif;
}

h1 {
  font-size: 20px;
}

#container {
  background: white;
  display: table;
  padding: 15px;
  margin: 30px auto;
  border-radius: 3px;
}

#error {
  margin-bottom: 15px;
  color: red;
}

input {
  width: 250px;
  padding: 5px;
  font-size: 16px;
  margin-bottom: 15px;
  border-radius: 3px;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  border: 1px solid #c0c0c0;
}
input:focus, input:active {
  border: 1px solid #c0c0c0;
  outline: none;
}
!

JS

            
              function join() {
  
  let firstname = document.getElementById('first-name').value;
  let email = document.getElementById('email').value;
  
  if(firstname.length < 1) {
    
    document.getElementById('error').innerHTML = 'Please enter your first name';
    document.getElementById('first-name').focus();
  }
  else if(email.length < 1) {
  
      document.getElementById('error').innerHTML = 'Please enter your email';
    document.getElementById('email').focus();
  }
  else {
    
    // Success - save the user data
    document.getElementById('container').innerHTML = 'Thanks!';
  }
}
!
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