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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <!-- :valid -->
<section class="example-cntr validation valid">
    <h1>CSS <code>:valid</code> pseudo-class</h1>
    <p>The <code>:valid</code> pseudo-class targets form elements whose formatting is correct according to that element’s required format.</p>
    <p>In the following example, when the email input field has an email structure formatted correctly, the field it’s considered “valid” and a <span class="green">green</span> border appears around the input.</p>
    <p><em><span class="underline">Note:</span> In its default state, the field is considered valid. Not sure about you, but to me that feels counterintuitive :p</em></p>
        <input type="email" id="email" placeholder="name@domain.com">

<!-- :invalid -->
<section class="example-cntr validation invalid">
    <h1>CSS <code>:invalid</code> pseudo-class</h1>
    <p>The <code>:invalid</code> pseudo-class targets form elements whose formatting isn’t correct according to that element’s required format.</p>
    <p>In the following example, when the email input field has an incorrectly formatted email structure it’s automatically invalid and a <span class="red">red</span> border appears around the input.</p>
        <input type="email" id="email" placeholder="name@domain.com">

              //'validations' generic styles
.validation {
    input[type=email] {
        box-sizing: content-box;
        width: 200px;
        padding: 0 5px;
        border: #666 5px solid;
        border-radius: 2px;
        cursor: text;
        transition: .5s;
    label { display: inline-block; }
    span {
        display: block;
        margin-bottom: 5px;

.valid {
    input[type=email]:valid { border-color: $g; }
.invalid {
    input[type=email]:invalid { border-color: $r; }

//Styling stuff not needed for demo
body {
    text-align: left;
    line-height: 1.5;
h1 {
    font-size: 24px;
    text-transform: none;
    border-bottom: #636363 1px dotted;
    code {
        display: inline-block;
        margin-bottom: 10px;
        color: $y;
        background: none;
        box-shadow: none;
code { font-size: 1em; }
input {
    width: 30px; height: 30px;
    vertical-align: middle;
    outline: none;
input, label { cursor: pointer; }
input[type=email] { width: 100%; }

label {
    padding: 3px 8px 5px;
    border-radius: 2px;
    border: transparent 1px solid;    
    transition: .5s;
    &:hover {
        border: rgba(white,.2) 1px solid;        
.example-cntr {
    max-width: 800px;
    margin: 0 auto 50px;
    padding: 30px;
    box-shadow: 0 1px 2px rgba(black,.3);
    background: rgba(black,.15);
.flex-ctnr {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;

span {
    &.yellow {
        display: inline-block;
        font-weight: bold;
        font-size: 18px;
        text-shadow: 0 1px 0 #000;
.underline { text-decoration: underline; }
.red { color: $r; }
.green { color: $g; }
.yellow { color: $y; }
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