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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

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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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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HTML 

              
                <div class="pulse1"></div>
<div class="pulse2"></div>
<div class="icon"></div>
!

CSS 

              
                body {
    overflow: hidden;
    background-color: DarkSeaGreen;
    background-image: 
    -webkit-linear-gradient(
    90deg, rgba(0,0,0,.1) 50%,
    transparent 25%, transparent 50%,  
    rgba(0,0,0,.1) 50%, rgba(0,0,0,.1) 90%, 
    transparent 75%, transparent);
    background-image: 
    -moz-linear-gradient(
    90deg, rgba(0,0,0,.1) 50%,
    transparent 25%, transparent 50%,  
    rgba(0,0,0,.1) 50%, rgba(0,0,0,.1) 90%, 
    transparent 75%, transparent);
    background-image:
    linear-gradient(
    90deg, rgba(0,0,0,.1) 50%,
    transparent 25%, transparent 50%,  
    rgba(0,0,0,.1) 50%, rgba(0,0,0,.1) 90%, 
    transparent 75%, transparent);
    background-size: 50px 50px;
}

.icon{
    position: absolute; 
    width: 180px;
    height: 180px;
    background: url(https://cdn1.iconfinder.com/data/icons/logotypes/32/circle-twitter-256.png) no-repeat;
    background-size: 180px 180px;
    margin: auto; 
    top: 0; left: 0; bottom: 0; right: 0;
    z-index: 3;
  
    -webkit-box-shadow: 
      0 0 0 10px   rgba(255,255,255,.2),
      0 0 25px 2px rgba(0,0,0,.4),
inset 0 0 0 15px   rgba(255,255,155,.4);
    -moz-box-shadow: 
      0 0 0 10px   rgba(255,255,255,.2),
      0 0 25px 2px rgba(0,0,0,.4),
inset 0 0 0 15px   rgba(255,255,155,.4);
    box-shadow: 
      0 0 0 10px   rgba(255,255,255,.2),
      0 0 25px 2px rgba(0,0,0,.4),
inset 0 0 0 15px   rgba(255,255,155,.4);
  
    -webkit-border-radius: 999px; 
    -moz-border-radius: 999px;
    border-radius: 999px;
    /* border-radius: 50% has issues on some mobile browsers */
}

.pulse1 {
    position: absolute;  
    width: 200px;
    height: 200px;
    margin: auto; 
    top: 0; left: 0; bottom: 0; right: 0;
    z-index: 1;
    opacity: 0;
    border: 3px solid rgba(255,255,255,.1);
  
    -webkit-animation: pulsejg1 4s linear infinite;
    -moz-animation: pulsejg1 4s linear infinite;
    animation: pulsejg1 4s linear infinite;
    -webkit-border-radius: 999px;
    -moz-border-radius: 999px;
    border-radius: 999px;
    -webkit-box-shadow: inset 0px 0px 15px 10px rgba(0, 0, 0, .6);
    -moz-box-shadow: inset 0px 0px 15px 10px rgba(0, 0, 0, .6);
    box-shadow: inset 0px 0px 15px 10px rgba(0, 0, 0, .6);
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

.pulse2 {
    position: absolute;
    width: 200px;
    height: 200px;
    margin: auto; 
    top: 0; left: 0; bottom: 0; right: 0;
    z-index: 2;
    opacity: 0;
    border: 1px solid rgba(255,255,255,0);
  
    -webkit-animation: pulsejg2 4s linear infinite;
    -moz-animation: pulsejg2 4s linear infinite;
    animation: pulsejg2 4s linear infinite;
    -webkit-border-radius: 999px;
    -moz-border-radius: 999px;
    border-radius: 999px;
    -webkit-box-shadow: inset 0px 0px 12px 5px rgba(255, 255, 255, .8);
    -moz-box-shadow: inset 0px 0px 12px 5px rgba(255, 255, 255, .8);
    box-shadow: inset 0px 0px 12px 5px rgba(255, 255, 255, .8);
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

@-webkit-keyframes pulsejg1 {
    0% {
        -webkit-transform: scale(.6);
        opacity: 0;
    }

    50% {
        -webkit-transform: scale(.6);
        opacity: 0;
    }

    60% {
        -webkit-transform: scale(.9);
        opacity: .2;
    }

    70% {
        -webkit-transform: scale(1.1);
        opacity: .35;
    }

    80% {
        -webkit-transform: scale(1.25);
        opacity: .2;
    }

    100% {
        -webkit-transform: scale(1.4);
        opacity: 0;
    }
}

@-moz-keyframes pulsejg1 {
    0% {
        -moz-transform: scale(.6);
        opacity: 0;
    }

    50% {
        -moz-transform: scale(.6);
        opacity: 0;
    }

    60% {
        -moz-transform: scale(.9);
        opacity: .2;
    }

    70% {
        -moz-transform: scale(1.1);
        opacity: .35;
    }

    80% {
        -moz-transform: scale(1.25);
        opacity: .2;
    }

    100% {
        -moz-transform: scale(1.4);
        opacity: 0;
    }
}

@keyframes pulsejg1 {
    0% {
        transform: scale(.6);
        opacity: 0;
    }

    50% {
        transform: scale(.6);
        opacity: 0;
    }

    60% {
        transform: scale(.9);
        opacity: .1;
    }

    70% {
        transform: scale(1.1);
        opacity: .25;
    }

    80% {
        transform: scale(1.25);
        opacity: .1;
    }

    100% {
        transform: scale(1.4);
        opacity: 0;
    }
}

@-webkit-keyframes pulsejg2 {
    0% {
        -webkit-transform: scale(.6);
        opacity: 0;
    }

    40% {
        -webkit-transform: scale(.8);
        opacity: .05;
    }

    50% {
        -webkit-transform: scale(1);
        opacity: .1;
    }

    60% {
        -webkit-transform: scale(1.1);
        opacity: .3;
    }

    80% {
        -webkit-transform: scale(1.2);
        opacity: .1;
    }

    100% {
        -webkit-transform: scale(1.3);
        opacity: 0;
    }
}

@-moz-keyframes pulsejg2 {
    0% {
        -moz-transform: scale(.6);
        opacity: 0;
    }

    40% {
        -moz-transform: scale(.8);
        opacity: .05;
    }

    50% {
        -moz-transform: scale(1);
        opacity: .1;
    }

    60% {
        -moz-transform: scale(1.1);
        opacity: .3;
    }

    80% {
        -moz-transform: scale(1.2);
        opacity: .1;
    }

    100% {
        -moz-transform: scale(1.3);
        opacity: 0;
    }
}

@keyframes pulsejg2 {
    0% {
        transform: scale(.6);
        opacity: 0;
    }

    40% {
        transform: scale(.8);
        opacity: .05;
    }

    50% {
        transform: scale(1);
        opacity: .1;
    }

    60% {
        transform: scale(1.1);
        opacity: .3;
    }

    80% {
        transform: scale(1.2);
        opacity: .1;
    }

    100% {
        transform: scale(1.3);
        opacity: 0;
    }
}
!

JS 

              
                /* 
jaschagoltermann.com 

Sorry for all the outdated prefxes - they are for mobile browsers mostly.

Use any picture. Does not have to be round. 
Picture should have an aspect ratio of 1:1.

Variation of my other pen: 
Water Drop Circle Effect as CSS3 Animation 
*/
!
999px

Console