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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

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Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <header class="primary-bg">
  <div>
    <h1>A Style Guide</h1>
    <h3>Raleway Monochrome</h3>
<nav role='navigation' class="text-white">
  <ul>
    <li><a href="#color">colors</a></li>
    <li><a href="#typography">typography</a></li>
    <li><a href="#buttons">buttons</a></li>
    <li><a href="#forms">forms</a></li>
    <li><a href="#backgrounds">backgrounds</a></li>
  </ul>
</nav>  
  </div>
</header>

<main>
  <article id="color">
    <p class="alt-color">color palette</p>
    <div class="box primary-bg">
      <p>Primary</p>
      <p>[ for backgrounds ]</p>
    </div>
    <div class="box alt-bg">
      <p>Alt Background</p>
      <p>[ for contrast + hovers ]</p>
    </div>
    <div class="box alt-color">
      <p>Alt Color for Links & Headings</p>
      <h4 class="alt-color"></h4>
      <p>[ for <a href="/">links</a> ]</p>
    </div>
    <div class="box">
      <p>Paragraph Text </p>
    </div>
   </article> 

   <article id="typography">
      <p class="alt-color">general typography</p>
      <h3>Font at 600 for headings</h3>
      <p>Font at normal for body text</p>
      <br />
      <p>Primary font: 'Raleway', sans-serif;</p>
      <p><em>Italics: 'Raleway', sans-serif;</em></p>
      <p><strong>Bold: 'Raleway', sans-serif;</strong></p>
      <p><u>Underline: 'Raleway', sans-serif;</u></p>
      <br />
   </article>

    <article id="headings">
      <p class="alt-color">headings</p>
      <h1>headings 1</h1>
      <h2>headings 2</h2>
      <h3>headings 3</h3>
      <h4>headings 4</h4>
      <h5>headings 5</h5>
      <h6>headings 6</h6>    
    </article>

    <article id="paragraphs">
      <p class="alt-color">paragraphs</p>
      <p class="lead">This is a lead paragraph.</p>
      <p>This is an <b>ordinary paragraph</b> that is <i>long enough</i> to wrap to <u>multiple lines</u> so that you can see how the line spacing looks.</p>
      <p>A paragraph (from the Greek paragraphos, "to write beside" or "written beside") is a self-contained unit of a discourse in writing dealing with a particular point or idea. A paragraph consists of one or more sentences. Though not required by the syntax of any language, paragraphs are usually an expected part of formal writing, used to organize longer prose.</p>
      <p><small>This is text in a small wrapper.</small></p>
      <p class="text-muted">Muted color paragraph.</p>
    </article>

    <article>
      <p class="alt-color">inline elements</p>

      <p><a href="#">This is a text link</a></p>

      <p><strong>Strong is used to indicate strong importance</strong></p>

      <p><em>This text has added emphasis</em></p>

      <p>The <b>b element</b> is stylistically different text from normal text, without any special importance</p>

      <p>The <i>i element</i> is text that is set off from the normal text</p>

      <p>The <u>u element</u> is text with an unarticulated, though explicitly rendered, non-textual annotation</p>

      <p><del>This text is deleted</del> and <ins>This text is inserted</ins></p>

      <p><s>This text has a strikethrough</s></p>

      <p>Superscript<sup>®</sup></p>

      <p>Subscript for things like H<sub>2</sub>O</p>

      <p><small>This small text is small for for fine print, etc.</small></p>

      <p>Abbreviation: <abbr title="HyperText Markup Language">HTML</abbr></p>

      <p>Keyboard input: <kbd>Cmd</kbd></p>

      <p><q cite="https://developer.mozilla.org/en-US/docs/HTML/Element/q">This text is a short inline quotation</q></p>

      <p><cite>This is a citation</cite>

      </p><p>The <dfn>dfn element</dfn> indicates a definition.</p>

      <p>The <mark>mark element</mark> indicates a highlight</p>

      <p><code>This is what inline code looks like.</code></p>

      <p><samp>This is sample output from a computer program</samp></p>

      <p>The <var>variable element</var>, such as <var>x</var> = <var>y</var></p>
    </article>

  <article id="buttons">
      <button class="large">large button</button>
      <button class="medium">medium button</button>
      <button class="medium primary-bg">medium button</button>
      <button class="medium alt-bg">medium button</button>
  </article>

    <article id="forms">
      <p class="alt-color">Forms</p>

      <div class="inner" id="radio">
      <form class="topLabel">  
      <span class="field-wrapper">
      <input id="Field1_0" name="Field1" type="radio" class="field radio" value="Fantasty" checked="checked" />
      <label class="choice" for="Field1_0" >
      Radio Option 1
      </label>
      </span>
      <span class="field-wrapper">
      <input id="Field1_1" name="Field1" type="radio" class="field radio" value="Sci-Fi" />
      <label class="choice" for="Field1_1" >
      Radio Option 2
      </label>
      </span>
      <span class="field-wrapper">
      <input id="Field1_2" name="Field1" type="radio" class="field radio" value="Don&#039;t make me choose!" />
      <label class="choice" for="Field1_2" >
      Radio Option 3
      </label> 
      </span>
      </div>

      <div class="inner" id="checkbox">
      <span class="field-wrapper">
      <input type="checkbox"  checked="checked" value="" id="checkbox1" />           <label class="checkbox" for="checkbox1">
      Checkbox Option 1
      </label>
      </span>
      <span class="field-wrapper">

      <input type="checkbox" value="" id="checkbox2" />
      <label class="checkbox" for="checkbox2">
        Checkbox Option 2
      </label>
      </span>
      <span class="field-wrapper">

      <input type="checkbox" value="" id="checkbox3" />
      <label class="checkbox" for="checkbox3">
        Checkbox Option 3
      </label>
      </span>
      </form>
      </div>

      <div class="inner" id="forms">
        <form action="" method="post" class="wpcf7-form" novalidate="novalidate">
        <div class="field-wrapper">
          <label for="yourname" class="float-label">Name</label>
          <span class="your-name"><input type="text" name="your-name" value="" size="40" class="" id="yourname" aria-required="true" aria-invalid="false" placeholder="Name"></span> 
        </div>
        <div class="field-wrapper">
          <label for="youremail" class="float-label">Email</label>
          <span class="wpcf7-form-control-wrap your-email"><input type="email" name="your-email" value="" size="40" id="youremail" aria-required="true" aria-invalid="false" placeholder="Email"></span> 
        </div>
        <div class="field-wrapper">
          <label for="yourmessage" class="float-label">Message</label>
          <span class="your-message">
            <textarea name="your-message" cols="40" rows="10" id="yourmessage" aria-invalid="false" placeholder="Message">
            </textarea></span>
        </div>
        <div class="field-wrapper">
        <input type="submit" value="Send" class="wpcf7-form-control wpcf7-submit">
        </div>
        </form>
      </div>
    </article>

    <article id="backgrounds">
      <p class="alt-color">backgrounds</p>
      <div class="article primary-bg">
        <h1>Primary-bg: This is a heading</h1>
        <p class="lead">This is a lead paragraph.</p>
        <p>This is an <b>ordinary paragraph</b> that is <i>long enough</i> to wrap to <u>multiple lines</u> so that you can see how the line spacing looks.</p>
        <p>A paragraph (from the Greek paragraphos, "to write beside" or "written beside") is a self-contained unit of a discourse in writing dealing with a particular point or idea. A paragraph consists of one or more sentences. Though not required by the syntax of any language, paragraphs are usually an expected part of formal writing, used to organize longer prose.</p>
        <p><small>This is text in a small wrapper.</small></p>
        <p class="text-muted">Muted color paragraph.</p>
      </div>

      <div class="article alt-bg">
        <h1>Alt-bg: This is a heading</h1>
        <p class="lead">This is a lead paragraph.</p>
        <p>This is an <b>ordinary paragraph</b> that is <i>long enough</i> to wrap to <u>multiple lines</u> so that you can see how the line spacing looks.</p>
        <p>A paragraph (from the Greek paragraphos, "to write beside" or "written beside") is a self-contained unit of a discourse in writing dealing with a particular point or idea. A paragraph consists of one or more sentences. Though not required by the syntax of any language, paragraphs are usually an expected part of formal writing, used to organize longer prose.</p>
        <p><small>This is text in a small wrapper.</small></p>
        <p class="text-muted">Muted color paragraph.</p>
      </div>

      <div class="article">
        <h1>This is a heading</h1>
        <p class="lead">This is a lead paragraph.</p>
        <p>This is an <b>ordinary paragraph</b> that is <i>long enough</i> to wrap to <u>multiple lines</u> so that you can see how the line spacing looks.</p>
        <p>A paragraph (from the Greek paragraphos, "to write beside" or "written beside") is a self-contained unit of a discourse in writing dealing with a particular point or idea. A paragraph consists of one or more sentences. Though not required by the syntax of any language, paragraphs are usually an expected part of formal writing, used to organize longer prose.</p>
        <p><small>This is text in a small wrapper.</small></p>
        <p class="text-muted">Muted color paragraph.</p>
      </div>
    </article>
</main>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Raleway:400,300,600,700,800);

body,
html {
  padding: 0;
  margin: 0;
}

*,
*:before,
*:after {
  box-sizing: border-box;
}

/* TYPE: size + shape */
body{
  font: 400 16px/1.2 'Raleway', sans-serif;
  letter-spacing: 0.5px;
}

a {
  color: inherit;
  text-decoration: underline;
}

a:hover {
  color: rgba(0,0,0,0.6);
  text-decoration: underline;
}

.primary-bg {
  background: SteelBlue;
  color: #f8f8f8;
}

.alt-bg {
  background: rgba(70, 130, 180, 0.6);
}

.alt-color {
  color: rgba(70, 130, 180, 0.6);
}

/* STRUCTURE */
header {
  width: 100%;
  padding: 10px 10px 30px;
  margin: 0 0 30px;
  text-align: center;
}

header nav ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

header nav ul li {
  display: inline;
  padding-right: 10px;
}

header nav ul li:last-of-type {
  padding-right: 0;
}

main {
  max-width: 900px;
  margin: 10px auto;
}

article,
.article {
  display: block;
  margin: 30px 0; 
  padding: 30px;
}

article h1,
article p {
  max-width: 600px;
}

.box {
  width: 25%;
  float: left;
  height: 200px;
  padding: 10px;
}

.box:before,
.box:after,
article:before,
article:after{
  content: '';
  display: table;
}

.box:after,
article:after{
  clear: both;
}

/* BUTTONS */
button{
  background: rgba(0,0,0,0.2);
  color: inherit;
  padding: 20px;
  border-radius: 0;
  border: 0;
  margin-right: 10px;
  margin-bottom: 1.5em;
  font-family: inherit;
  font-size: inherit;
  font-weight: 700;
}

button:hover{
  background: rgba(0,0,0,0.7);
  color: #fff;
}

button.medium {
  display: inline;
  max-width: 100px;
}

button.large {
  width: 70%;
  display: block;
}

button{
  /* box shadow */
   -webkit-box-shadow: 6px 6px 0 0 #000;  /* Safari 3-4, iOS 4.0.2 - 4.2, Android 2.3+ */
  -moz-box-shadow: 6px 6px 0 0 #000;  /* Firefox 3.5 - 3.6 */
  box-shadow: 4px 4px 0 0 #000;  /* Opera 10.5, IE 9, Firefox 4+, Chrome 6+, iOS 5 */
}

/* FORMS */

.field-wrapper {
  display: block;
  position:relative;
  margin-bottom: 0.25em;
}

label {
  display: block;
  margin-bottom: 1.5em;
}

select, textarea, input[type="text"], input[type="password"], input[type="file"], input[type="datetime"], input[type="datetime-local"], input[type="date"], input[type="month"], input[type="time"], input[type="week"], input[type="number"], input[type="email"], input[type="url"], input[type="search"], input[type="tel"], input[type="color"], .uneditable-input, .faux-file {
  display: inline-block;
  padding: 0 .4em 0 .4em;
  padding: .5em;
  vertical-align: middle;
  min-width: 50px;
  max-width: 550px;
}

textarea, input[type="text"], input[type="password"], input[type="file"], input[type="datetime"], input[type="datetime-local"], input[type="date"], input[type="month"], input[type="time"], input[type="week"], input[type="number"], input[type="email"], input[type="url"], input[type="search"], input[type="tel"], input[type="color"],  .uneditable-input, .faux-file {
  width: 100%;
  min-height: 36px;
  border: 3px solid #000;
  margin: 0 0 1em 0;
  font-family: inherit;  
  font-size: inherit;  
}

textarea:hover,
input[type="text"]:hover,
input[type="email"]:hover,
input[type="submit"]:hover,
textarea:focus,
input[type="text"]:focus,
input[type="email"]:focus {
  background: transparent;
  border: 3px solid #a9a9a9;
}

textarea:focus,
input[type="text"]:focus,
input[type="email"]:focus, 
input[type="submit"] {
  outline: none;
}

/* Radio + Checkbox */
input[type=radio] + label,
input[type=checkbox] + label{  
    display: inline-block;  
    cursor: pointer;  
    position: relative;  
    padding-left: 30px;  
    margin-right: 15px;  
}  

input[type=radio],
input[type=checkbox] {  
    display: none;  
}  

input[type=radio] + label:before,
input[type=checkbox] + label:before{  
    content: "";  
    display: inline-block;  
  
    width: 15px;  
    height: 15px;  
  
    margin-right: 20px;  
    position: absolute;  
    left: 0;  

    bottombottom: 1px;  
    border: 3px solid;  
}  

input[type=radio]:checked + label:before,
input[type=checkbox]:checked + label:before {  
    background: #262626;
    color: #555;  
    font-size: 12px;  
    text-align: center;  
    line-height: 14px; 
}  

input[type=radio] + label:before {  
  border-radius: 50%;
}

input[type=submit]{
  background: #fff;
  border: 3px solid;
  padding: 9px;
  font-family: inherit;  
  font-size: inherit;
  font-weight: inherit;
}

input[type=submit]:hover{
  color: rgba(0,0,0,0.5);
}
!

JS
!
999px

Console