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HTML

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About the <head>

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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.

Vendor Prefixing

About Vendor Prefixing

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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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HTML 

              
                <div class="container">
  <div class="row">
    <div class="col-sm-12 text-center">
      <h2>Level of Difficulty</h2>
    </div>
    <div class="col-sm-12">
      <div class="radio-pillbox">
        <radiogroup>
          <div>
            <input type="radio" name="radio-group" id="easy" value="Easy" class="first">
            <label for="easy" class="radio-label">Easy</label>
            </input>
          </div>
          <div>
            <input type="radio" name="radio-group" id="tricky" value="Tricky">
            <label for="tricky">Tricky</label>
            </input>
          </div>
          <div>
            <input type="radio" name="radio-group" id="challenging" value="Challenging">
            <label for="challenging">Challenging</label>
            </input>
          </div>
          <div>
            <input type="radio" name="radio-group" id="gruelling" value="Gruelling">
            <label for="gruelling">Gruelling</label>
            </input>
          </div>
          <div>
            <input type="radio" name="radio-group" id="Q1-5" value="Overwhelmingly">
            <label for="Q1-5">Overwhelming</label>
            </input>
          </div>
          <div>
            <input type="radio" name="radio-group" id="mind-boggling" value="Mind Boggling" class="last">
            <label for="mind-boggling">Mind Boggling</label>
            </input>
          </div>
        </radiogroup>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                body {
  background: #f0f8ff;
}

.container {
  margin-top: 40vh;
}

.radio-label {
  width: 100%;
  margin-bottom: 1em;
  text-align: center;
}

.radio-pillbox {
  height: 5em;
  width: 100%;
  font-size: 1em;
  border: 0;
  border-radius: 75px;
  overflow: hidden;
  background: -webkit-linear-gradient(
    100deg,
    #0ef49b 0%,
    #d2dc69 30%,
    #faa04b 70%,
    #ff5a64 100%
  );
  background: -moz-linear-gradient(
    100deg,
    #0ef49b 0%,
    #d2dc69 30%,
    #faa04b 70%,
    #ff5a64 100%
  );
  background: -o-linear-gradient(
    100deg,
    #0ef49b 0%,
    #d2dc69 30%,
    #faa04b 70%,
    #ff5a64 100%
  );
  background: -ms-linear-gradient(
    100deg,
    #0ef49b 0%,
    #d2dc69 30%,
    #faa04b 70%,
    #ff5a64 100%
  );
  background: linear-gradient(
    100deg,
    #0ef49b 0%,
    #d2dc69 30%,
    #faa04b 70%,
    #ff5a64 100%
  );
  color: #000000;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.16), 0 2px 10px 0 rgba(0, 0, 0, 0.12);
}

.radio-pillbox radiogroup {
  height: 100%;
  width: 100%;
  display: flex;
}

.radio-pillbox radiogroup div {
  width: 100%;
  position: relative;
}

.radio-pillbox radiogroup div input {
  -webkit-appearance: inherit;
  width: 100%;
  height: 100%;
  transition: background 300ms ease-out;
  margin: 0;
  outline: 0;
  border-left: 1px solid rgba(0, 0, 0, 0.05);
}

.radio-pillbox radiogroup div input:checked {
  color: #5f6982;
  border: none;
  box-shadow: inset 0 10px 50px rgba(25, 25, 25, 0.1);
}

.radio-pillbox radiogroup .first {
  border-radius: 75px 0 0 75px;
  border-left: none;
}

.radio-pillbox radiogroup .last {
  border-radius: 0 75px 75px 0;
}

.radio-pillbox radiogroup div label {
  position: absolute;
  top: 50%; /* top plus line-height centers text */
  line-height: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: center;
}

.radio-pillbox input:focus {
  outline: 0;
}

.radio-pillbox label:after {
  content: "\2714";
  display: inline-block;
  -webkit-transform: scale(0);
  -moz-transform: scale(0);
  -o-transform: scale(0);
  -ms-transform: scale(0);
  transform: scale(0);
  -webkit-transition: margin 250ms cubic-bezier(0.6, -0.28, 0.735, 0.045) 100ms,
    -webkit-transform 250ms cubic-bezier(0.895, 0.03, 0.685, 0.22);
  -moz-transition: margin 250ms cubic-bezier(0.6, -0.28, 0.735, 0.045) 100ms,
    -moz-transform 250ms cubic-bezier(0.895, 0.03, 0.685, 0.22);
  -o-transition: margin 250ms cubic-bezier(0.6, -0.28, 0.735, 0.045) 100ms,
    -o-transform 250ms cubic-bezier(0.895, 0.03, 0.685, 0.22);
  transition: margin 250ms cubic-bezier(0.6, -0.28, 0.735, 0.045) 100ms,
    transform 250ms cubic-bezier(0.895, 0.03, 0.685, 0.22);
}

.radio-pillbox input:checked + label:after {
  margin-left: 12px;
  -webkit-transform: scale(1.25);
  -moz-transform: scale(1.25);
  -o-transform: scale(1.25);
  -ms-transform: scale(1.25);
  transform: scale(1.25);
  -webkit-transition: -webkit-transform 500ms
      cubic-bezier(0.175, 0.885, 0.32, 1.275) 250ms,
    margin 500ms,
    -webkit-transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275) 250ms;
  -moz-transition: -moz-transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275)
      250ms,
    margin 500ms,
    -moz-transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275) 250ms;
  -o-transition: -o-transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275)
      250ms,
    margin 500ms,
    -o-transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275) 250ms;
  transition: transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275) 250ms,
    margin 500ms, transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275) 250ms;
}
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