Botão com sombra longa com CSS3 e SASS

@import url(http://weloveiconfonts.com/api/?family=fontawesome|zocial);
html, body{
width: 100%;
height: 100%;
min-height: 100%;
background-color: #30303A;
display: flex;
align-items: center;
justify-content: center;
}
/* fontawesome */
[class*="fontawesome-"]:before {
font-family: 'FontAwesome', sans-serif;
}
/* zocial */
[class*="zocial-"]:before {
font-family: 'Zocial', sans-serif;
}
<div class="icons">
<a href="#" class="zocial-twitter twitter social-icon"></a>
<a href="#" class="fontawesome-facebook facebook social-icon"></a>
<a href="#" class="zocial-stumbleupon stumbleupon social-icon"></a>
<a href="#" class="zocial-googleplus google-plus social-icon"></a>
</div>
.social-icon{
text-decoration: none;
color: white;
display: inline-block;
font-size: 2.5em;
width: 80px;
height: 80px;
line-height: 80px;
border-radius: 40px;
overflow: hidden;
margin: 0 10px;
text-align: center;
}
$color-twitter: #55acee;
$color-facebook: #3b5998;
$color-stumbleupon: #f74425;
$color-google-plus: #dd4b39;
@function makelongshadow($color){
$val: 0px 0px $color;
@for $i from 1 through 35 {
$val: #{$val}, #{$i}px #{$i}px #{$color};
}
@return $val;
}
.twitter {
background: $color-twitter;
text-shadow: makelongshadow(darken($color-twitter, 10%));
}

.facebook {
background: $color-facebook;
text-shadow: makelongshadow(darken($color-facebook, 10%));
}

.stumbleupon {
background: $color-stumbleupon;
text-shadow: makelongshadow(darken($color-stumbleupon, 10%));
}

.google-plus {
background: $color-google-plus;
text-shadow: makelongshadow(darken($color-google-plus, 10%));
}
.google-plus {
background: #dd4b39;
text-shadow: 0px 0px #c23321,
1px 1px #c23321,
2px 2px #c23321,
3px 3px #c23321,
4px 4px #c23321,
5px 5px #c23321,
6px 6px #c23321,
7px 7px #c23321,
8px 8px #c23321,
9px 9px #c23321,
10px 10px #c23321,
11px 11px #c23321,
12px 12px #c23321,
13px 13px #c23321,
14px 14px #c23321,
15px 15px #c23321,
16px 16px #c23321,
17px 17px #c23321,
18px 18px #c23321,
19px 19px #c23321,
20px 20px #c23321,
21px 21px #c23321,
22px 22px #c23321,
23px 23px #c23321,
24px 24px #c23321,
25px 25px #c23321,
26px 26px #c23321,
27px 27px #c23321,
28px 28px #c23321,
29px 29px #c23321,
30px 30px #c23321,
31px 31px #c23321,
32px 32px #c23321,
33px 33px #c23321,
34px 34px #c23321,
35px 35px #c23321;
}

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Entusiasta pelo estudo de novas tecnologias, por projetos open source e CSS Evangelista.

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Henrique Melanda

Henrique Melanda

Entusiasta pelo estudo de novas tecnologias, por projetos open source e CSS Evangelista.

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