avinal.github.io/custom/css/particles-404.css

/*
 * Particles - 404 Page
 * Build Date: October 2016
 * Author: joashp
 */


/* custom CSS files */

@import url(common/font-awesome.min.css);
@import url("https://fonts.googleapis.com/css?family=Share+Tech+Mono%7CSpace+Mono");

/*
* http://meyerweb.com/eric/tools/css/reset/ 
* v2.0 | 20110126
* License: none (public domain)
*/

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,
main {
    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;
}


/* ---------------particles 404 style---------------------- */

body {
    padding: 0;
    margin: 0;
    font-size: 18px;
    background: #212121;
}

.container {
    min-height: 100vh;
    position: relative;
    padding: 240px 0;
    box-sizing: border-box;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.content {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    transform: translate(-50%, -50%);
}

.message {
    text-align: center;
    color: #ffffff;
}

.message-heading {
    font-family: "Share Tech Mono";
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: .7em;
    font-size: 2rem;
    padding: 0 0 0 1.4em;
}

.message-description {
    font-family: "Space Mono";
    line-height: 42px;
    font-size: 15px;
    letter-spacing: .15rem;
    padding: 0 20px;
    max-width: 600px;
    margin: auto;
}

.links {
    max-width: 600px;
    margin: 40px auto 0;
    text-align: center;
}

.links a {
    width: 170px;
    display: inline-block;
    padding: 15px 0;
    margin: 0 15px;
    border: 1px solid #ffffff;
    color: #ffffff;
    text-decoration: none;
    font-family: "Space Mono";
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: .1rem;
    position: relative;
}

.links a:before {
    content: '';
    height: 46px;
    background: #ffffff;
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    transition: all .3s;
}

.links a:after {
    transition: all .3s;
    z-index: 999;
    position: relative;
    content: "back to hompage";
}

.links a:hover:before {
    width: 170px;
}

.links a:hover:after {
    color: #000000;
}

.links a:nth-child(2) {
    background: #ffffff;
    color: #000000;
}

.links a:nth-child(2):before {
    background: #212121;
    left: 0;
}

.links a:nth-child(2):after {
    content: "report error";
}

.links a:nth-child(2):hover:after {
    color: #ffffff;
}

.social {
    position: absolute;
    bottom: 15px;
    left: 15px;
}

.social-list {
    margin: 0;
    padding: 0;
    list-style-type: none;
}

.social-list li {
    display: inline-block;
    margin: 5px 10px;
}

.social-list li a {
    color: #ffffff;
}

@media (max-width: 480px) {
    .message-heading {
        font-size: 1rem;
        margin-bottom: 30px;
    }
    .message-description {
        font-size: .7rem;
        line-height: 2rem;
    }
    .links a {
        margin: 10px;
        width: 280px;
    }
    .social {
        left: 50%;
        margin-left: -55px;
    }
}