Captain America’s shield CSS - Snippet

Preview
HTML
CSS
JS

<div class="sombra"></div>
<div id="escudo"><span>&#9733;</span></div>

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
/*CODIGO
@dhenriquez
http://www.dhenriquez.cl
*/
#escudo{
    width:30px;
    height:30px;
    background:#000099;
    color:#FFF;
    border-radius:50%;
    font-size:30px;
    padding:0;
    margin:0;
    border:#F00 10px solid;
    position:absolute;
    top:50%;
    left:50%;
    margin-top:-15px;
    margin-left:-15px;
}
    #escudo span{
        top:0px;
        left:0px;
        position:absolute;
    }
#escudo:before{
    content:" ";
    position:absolute;
    border:10px solid #FFF;
    width:50px;
    height:50px;
    border-radius:50%;
    left:-20px;
    top:-20px;
}
#escudo:after{
    content:" ";
    position:absolute;
    border:#F00 10px solid;
    width:70px;
    height:70px;
    border-radius:50%;
    left:-30px;
    top:-30px;
    box-shadow:1px 0 5px #000000;
}
/*Opcional*/
.sombra{
    width:90px;
    height:90px;
    border-radius:50%;
    position:absolute;
    top:50%;
    left:50%;
    margin-left:-35px;
    margin-top:-35px;
    z-index:99;
    opacity:0.3;
    /* http://gradients.glrzad.com/ */
    background-image: linear-gradient(bottom, rgb(0,0,0) 0%, rgb(255,255,255) 100%);
    background-image: -o-linear-gradient(bottom, rgb(0,0,0) 0%, rgb(255,255,255) 100%);
    background-image: -moz-linear-gradient(bottom, rgb(0,0,0) 0%, rgb(255,255,255) 100%);
    background-image: -webkit-linear-gradient(bottom, rgb(0,0,0) 0%, rgb(255,255,255) 100%);
    background-image: -ms-linear-gradient(bottom, rgb(0,0,0) 0%, rgb(255,255,255) 100%);
    background-image: -webkit-gradient(
        linear,
        left bottom,
        left top,
        color-stop(0, rgb(0,0,0)),
        color-stop(1, rgb(255,255,255))
    );
    
}
.creditos{
    width:auto;
    margin-left:auto;
    margin-right:auto;
}