Aqui 3 <br /><style>
    *, *:after, *:before {
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
        -ms-box-sizing: border-box;
        box-sizing: border-box; }

    html {
        background: #ccc;
        font: bold 14px/20px "Trajan Pro", "Times New Roman", Times, serif;
        color: #430400;
        text-shadow: 0 1px 0 rgba(255, 255, 255, 0.15); }

    .error-page-wrap {
        width: 310px;
        height: 310px;
        margin: 155px auto; }
    .error-page-wrap:before {
        box-shadow: 0 0 200px 150px #fff;
        width: 310px;
        height: 310px;
        border-radius: 50%;
        position: relative;
        z-index: -1;
        content: '';
        display: block; }

    .error-page {
        width: 310px;
        height: 310px;
        border-radius: 50%;
        top: -310px;
        position: relative;
        text-align: center;
        background: #d36242;
        background: -moz-linear-gradient(top, #d36242 0%, darkred 100%);
        background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #d36242), color-stop(100%, darkred));
        background: -webkit-linear-gradient(top, #d36242 0%, darkred 100%);
        background: -o-linear-gradient(top, #d36242 0%, darkred 100%);
        background: -ms-linear-gradient(top, #d36242 0%, darkred 100%);
        background: linear-gradient(to bottom, #d36242 0%, darkred 100%);
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='$firstColor', endColorstr='$secondColor',GradientType=0 ); }
    .error-page:before {
        width: 63px;
        height: 63px;
        border-radius: 50%;
        box-shadow: 3px 25px 0 5px #C95439;
        content: '';
        z-index: -1;
        display: block;
        position: relative;
        top: -19px;
        left: 44px; }
    .error-page:after {
        width: 310px;
        height: 17px;
        margin: 0 auto;
        top: 25px;
        content: '';
        z-index: -1;
        display: block;
        position: relative;
        background: -moz-radial-gradient(center, ellipse cover, rgba(0, 0, 0, 0.65) 0%, rgba(35, 26, 26, 0) 59%, rgba(60, 44, 44, 0) 100%);
        background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgba(0, 0, 0, 0.65)), color-stop(59%, rgba(35, 26, 26, 0)), color-stop(100%, rgba(60, 44, 44, 0)));
        background: -webkit-radial-gradient(center, ellipse cover, rgba(0, 0, 0, 0.65) 0%, rgba(35, 26, 26, 0) 59%, rgba(60, 44, 44, 0) 100%);
        background: -o-radial-gradient(center, ellipse cover, rgba(0, 0, 0, 0.65) 0%, rgba(35, 26, 26, 0) 59%, rgba(60, 44, 44, 0) 100%);
        background: -ms-radial-gradient(center, ellipse cover, rgba(0, 0, 0, 0.65) 0%, rgba(35, 26, 26, 0) 59%, rgba(60, 44, 44, 0) 100%);
        background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.65) 0%, rgba(35, 26, 26, 0) 59%, rgba(60, 44, 44, 0) 100%);
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#a6000000', endColorstr='#003c2c2c',GradientType=1 ); }
    .error-page h1 {
        color: rgba(255, 255, 255, 0.94);
        font-size: 100px;
        margin: 65px auto 0 auto;
        text-shadow: 0px 0 7px rgba(0, 0, 0, 0.5); }
    .error-page h1:before {
        width: 260px;
        height: 1px;
        position: relative;
        margin: 0 auto;
        top: 70px;
        content: '';
        display: block;
        background: -moz-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgba(111, 25, 25, 0.65)), color-stop(70%, rgba(75, 38, 38, 0)), color-stop(100%, rgba(60, 44, 44, 0)));
        background: -webkit-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: -o-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: -ms-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: radial-gradient(ellipse at center, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#a66f1919', endColorstr='#003c2c2c',GradientType=1 ); }
    .error-page h1:after {
        width: 260px;
        height: 1px;
        content: '';
        display: block;
        opacity: 0.2;
        margin: 0 auto;
        top: 50px;
        position: relative;
        background: -moz-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgba(247, 173, 148, 0.65)), color-stop(99%, rgba(255, 255, 255, 0.01)), color-stop(100%, rgba(255, 255, 255, 0)));
        background: -webkit-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: -o-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: -ms-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: radial-gradient(ellipse at center, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#a6f7ad94', endColorstr='#00ffffff',GradientType=1 ); }
    .error-page h2 {
        margin: 55px 0 30px 0;
        font-size: 17px; }
    .error-page h2:before {
        width: 130px;
        height: 1px;
        position: relative;
        margin: 0 auto;
        top: 31px;
        content: '';
        display: block;
        background: -moz-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgba(111, 25, 25, 0.65)), color-stop(70%, rgba(75, 38, 38, 0)), color-stop(100%, rgba(60, 44, 44, 0)));
        background: -webkit-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: -o-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: -ms-radial-gradient(center, ellipse cover, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        background: radial-gradient(ellipse at center, rgba(111, 25, 25, 0.65) 0%, rgba(75, 38, 38, 0) 70%, rgba(60, 44, 44, 0) 100%);
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#a66f1919', endColorstr='#003c2c2c',GradientType=1 ); }
    .error-page h2:after {
        width: 130px;
        height: 1px;
        content: '';
        display: block;
        opacity: 0.2;
        margin: 0 auto;
        top: 11px;
        position: relative;
        background: -moz-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgba(247, 173, 148, 0.65)), color-stop(99%, rgba(255, 255, 255, 0.01)), color-stop(100%, rgba(255, 255, 255, 0)));
        background: -webkit-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: -o-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: -ms-radial-gradient(center, ellipse cover, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        background: radial-gradient(ellipse at center, rgba(247, 173, 148, 0.65) 0%, rgba(255, 255, 255, 0.01) 99%, rgba(255, 255, 255, 0) 100%);
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#a6f7ad94', endColorstr='#00ffffff',GradientType=1 ); }

    .error-back {
        text-decoration: none;
        color: #430400;
        font-size: 15px; }
    .error-back:hover {
        color: #EB957D;
        text-shadow: 0 0 3px black; }

</style>
<div class="error-page-wrap">
    <article class="error-page gradient">
        <hgroup>
            <h1>500</h1>
            <h2>The client request could not be found</h2>
        </hgroup>
        <a href="docs" title="Back to site" class="error-back">back</a>
    </article>
</div>