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HTML

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CSS

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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.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                onlineonline<div class="sidebar">
  <div id="avatar-frame" class="online">
    <span class="gloss"></span>
    <img width="100px" height="100px" src="https://yequari.com/images/avatar.jpg"/>
    
  </div>
  <form name="online-status">
    <input type="radio" name="status" value="online" checked>Online</input>
  <input type="radio" name="status" value="busy">Busy</input>
  </form>
</div>
!

CSS 

              
                .sidebar #avatar-frame {
    width: fit-content;
    height: 100px;
    margin: 0 auto;
    padding: 8px 8px;
    border: 1px solid #cccccf;
    border-radius: 16px/24px;
    position: relative;
}

.online {
  background: linear-gradient(#D6FFDB00 0%, #D6FFDB 30%, #66FF00 100%);
  box-shadow: 0 5px 10px #66FF00;
}

.busy {
  background: linear-gradient(#FF9A0000 0%, #D8820055 30%,  #fca30d 100%);
  box-shadow: 0 5px 10px #fca30d;
}

.sidebar #avatar-frame img {
    max-width: 100px;
    border: 1px solid grey;
    border-radius: 5px;
   
}

.gloss {
  width: 100%;
  height: 100%;
/*   background: red; */
  background: radial-gradient(ellipse 200px 140px at 50% 0%, rgba(255,255,255,0.25) 0%, rgba(255,255,255,0.25) 50%,
  rgba(255,255,255,0) 51%);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
  border-radius: 16px/24px;
}
!

JS 

              
                let online = 'linear-gradient(#D6FFDB 0%, #66FF00 100%)'
let busy = 'linear-gradient(#fca30d 0%, #FF9A00 100%);'

const frame = document.querySelector('#avatar-frame');

const f = document.querySelectorAll('input[name=\'status\']').forEach((radio) => {
  radio.addEventListener('click', (event) => {
    switch(event.target.value) {
      case 'online':
        frame.className = 'online'
        break;
      case 'busy':
        frame.className = 'busy'
        break;
    }
  });
});
!
999px

Console