html - CSS div align to bottom center

Question

I'm trying to align my <div class="social-icons"> into bottom center of my sidebar. Well icon is on bottom of the page, but on the left.

Screenshot of page: Page screenshot

My code:

@font-face {
  font-family: 'FontAwesome';
  src: url('../fonts/fontawesome-webfont.eot?v=4.2.0');
  src: url('../fonts/fontawesome-webfont.eot?#iefix&v=4.2.0') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff?v=4.2.0') format('woff'), url('../fonts/fontawesome-webfont.ttf?v=4.2.0') format('truetype'), url('../fonts/fontawesome-webfont.svg?v=4.2.0#fontawesomeregular') format('svg');
  font-weight: normal;
  font-style: normal;
}


/*---------------------------------------------------------
 1. Reset
-------------------------------------------------------- */

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%;
  vertical-align: baseline;
}

.blue {
  color: #06C;
}

.green {
  color: #090;
}

main {
  display: block;
}

body {
  line-height: 1;
}

ol,
ul {
  list-style: none;
}

blockquote,
q {
  quotes: none;
}

blockquote:before,
blockquote:after {
  content: '';
  content: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

a:focus {
  outline: none;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
nav,
section {
  display: block;
}

audio,
canvas,
video {
  display: inline-block;
  *display: inline;
  *zoom: 1;
}

audio:not([controls]) {
  display: none;
}

sub,
sup {
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sup {
  top: -.5em;
}

sub {
  bottom: -.25em;
}

img {
  border: 0;
  -ms-interpolation-mode: bicubic;
}

button,
input,
select,
textarea {
  font-size: 100%;
  margin: 0;
  vertical-align: baseline;
  *vertical-align: middle;
}

button,
input {
  line-height: normal;
  *overflow: visible;
}

button::-moz-focus-inner,
input::-moz-focus-inner {
  border: 0;
  padding: 0;
}

button,
input[type="button"],
input[type="reset"],
input[type="submit"] {
  cursor: pointer;
  -webkit-appearance: button;
}

input[type="search"] {
  -webkit-appearance: textfield;
}

input[type="search"]:-webkit-search-decoration {
  -webkit-appearance: none;
}

textarea {
  overflow: auto;
  vertical-align: top;
}


/*---------------------------------------------------------
 2. Basic Style
-------------------------------------------------------- */

body {
  font-size: 14px;
  line-height: 24px;
  color: #777777;
  font-family: 'Verdana';
  overflow-x: hidden;
}

a {
  color: #006699;
  -webkit-transition: all 150ms ease-in-out;
  -moz-transition: all 150ms ease-in-out;
  -ms-transition: all 150ms ease-in-out;
  -o-transition: all 150ms ease-in-out;
  transition: all 150ms ease-in-out;
  text-decoration: none !important;
}

a:hover {
  color: #555555;
}

h1,
h2,
h3,
h4,
h5 {
  color: #555555;
  font-weight: bold;
}

::-webkit-input-placeholder {
  color: #999999;
}

:-moz-placeholder {
  /* Firefox 18- */
  color: #999999;
}

::-moz-placeholder {
  /* Firefox 19+ */
  color: #999999;
}

:-ms-input-placeholder {
  color: #999999;
}

.main-content,
.banner-bg {
  float: right;
  width: 87%;
}

@media screen and (max-width: 1290px) {
  .main-content,
  .banner-bg {
    width: 70%;
  }
}

@media screen and (max-width: 992px) {
  .main-content,
  .banner-bg {
    width: 100%;
  }
}

.content-wrapper {
  padding: 0 80px;
}

@media screen and (max-width: 992px) {
  .content-wrapper {
    padding: 0 30px;
  }
}

h4.widget-title {
  font-size: 16px;
  font-family: 'Verdana';
  text-transform: uppercase;
  margin-bottom: 40px;
}

hr {
  position: relative;
  outline: 0;
  border: 0;
  width: 100%;
  height: 4px;
  background: #dddddd;
  margin-top: 40px;
  margin-bottom: 0;
}

.page-section {
  padding-top: 80px;
}


/*---------------------------------------------------------
 3. Header
-------------------------------------------------------- */

.sidebar-menu {
  float: left;
  width: 13%;
  height: 100%;
  position: fixed;
  background-color: #384553;
  color: white;
  overflow-y: hidden;
}

@media screen and (max-width: 1290px) {
  .sidebar-menu {
    overflow-y: scroll;
    width: 30%;
  }
}

.top-section {
  padding: 40px;
}

.profile-image {
  width: 150px;
  height: 150px;
  border: 4px solid white;
  border-color: #505050;
  -webkit-border-radius: 75px;
  border-radius: 75px;
  overflow: hidden;
  margin-bottom: 20px;
  margin: auto;
}

.profile-image img {
  width: 100%;
}

h3.profile-title {
  margin-bottom: 5px;
  color: white;
  font-size: 18px;
  font-family: 'Verdana';
  margin-top: 20px;
}

.main-navigation {
  margin: 30px 0;
}

.main-navigation li {
  display: block;
}

.main-navigation li a {
  padding: 15px 40px;
  display: block;
  color: white;
  font-size: 14px;
}

.main-navigation li a i {
  margin-right: 15px;
  font-size: 24px;
}

.main-navigation li a:hover {
  background: #5b6878;
}

.main-navigation li a.active {
  background: #495461;
}

.main-navigation li a.active:hover {
  background: #495461;
}

.social-icons {
  padding: 30px 40px;
  position: fixed;
  bottom: 0;
  margin: auto;
  text-align: center;
}


/* .social-icons li {
  display: inline-block;
  margin-right: 20px;
}   */

.social-icons a {
  font-size: 18px;
  color: white;
}

.social-icons a:hover {
  color: #282e35;
}

.responsive-header {
  background: #5f6d7e;
  text-align: center;
}

@media screen and (max-width: 992px) {
  .responsive-header .main-navigation {
    margin-top: 10px;
    display: none;
  }
}

@media screen and (max-width: 992px) {
  .responsive-header p {
    color: white;
  }
}

@media screen and (max-width: 992px) {
  .responsive-header .profile-image {
    float: left;
    width: 100px;
    height: 100px;
    -webkit-border-radius: 50px;
    border-radius: 50px;
    overflow: hidden;
    margin-right: 30px;
  }
  .responsive-header .profile-content {
    text-align: left;
    margin-top: 30px;
    overflow: hidden;
  }
}

@media screen and (max-width: 992px) {
  .top-section {
    padding-bottom: 0;
  }
}

@media screen and (max-width: 992px) {
  .main-navigation a {
    padding: 10px;
  }
  .main-navigation a.active {
    background: #5f6d7e !important;
  }
  .main-navigation a:hover {
    background: #5f6d7e !important;
  }
}

.toggle-menu {
  width: 100%;
  display: block;
  padding: 20px;
  margin-top: 30px;
  background: #6cc0f7;
  color: white;
  font-size: 18px;
}

.toggle-menu:hover {
  color: white;
}


/*---------------------------------------------------------
 4. Main Content
-------------------------------------------------------- */


/*------ banner ------ */

.banner-bg {
  padding: 180px 80px;
  position: relative;
  background: url("../img/7.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  z-index: 2;
}

.banner-overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgba(95, 109, 126, 0.4);
  top: 0;
  left: 0;
  z-index: 3;
}

.welcome-text {
  position: relative;
  z-index: 4;
}

.welcome-text h2 {
  font-size: 42px;
  font-family: 'Verdana';
  color: white;
  margin-bottom: 30px;
}

.welcome-text h5 {
  font-size: 22px;
  color: white;
}


/*------ about us ------ */

.about-image {
  overflow: hidden;
  border: 4px solid #dddddd;
  margin-bottom: 40px;
}

.about-image img {
  width: 100%;
  display: block;
}


/*------ projects ------ */

.projects-holder {
  margin-right: 0;
  margin-left: 0;
  margin-top: 40px;
}

.projects-holder .col-md-4,
.projects-holder .col-md-4 {
  padding-right: 1px;
  padding-left: 1px;
}

.project-item {
  width: 100%;
  margin-bottom: 2px;
  overflow: hidden;
  position: relative;
}

.project-item img {
  width: 100%;
  display: block;
}

.project-item:hover .project-hover {
  top: 0;
  opacity: 1;
  visibility: visible;
}

.project-hover {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 40px;
  left: 0;
  background: rgba(0, 0, 0, 0.9);
  opacity: 0;
  visibility: 0;
  -webkit-transition: all 200ms linear;
  -moz-transition: all 200ms linear;
  -ms-transition: all 200ms linear;
  -o-transition: all 200ms linear;
  transition: all 200ms linear;
}

.project-hover .inside {
  position: absolute;
  width: 100%;
  left: 0;
  bottom: 0;
  padding: 30px;
}

.project-hover h5 {
  font-size: 16px;
  margin-bottom: 15px;
}

.project-hover h5 a {
  color: white;
}

.project-hover p {
  color: white;
  font-size: 13px;
  line-height: 20px;
}


/*------ contact ------ */

.contact-form {
  margin-top: 40px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  outline: 0;
  border: 1px solid #aaaaaa;
  padding: 12px;
  color: #999999;
  margin-bottom: 30px;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 0;
}

.contact-form .button {
  width: auto;
  background: #5f6d7e;
  color: white;
  text-transform: uppercase;
  border: 0;
}


/*---------------------------------------------------------
 5. Footer
-------------------------------------------------------- */

#footer p.copyright-text {
  margin: 40px 0;
  font-size: 13px;
}

#footer p.copyright-text a {
  color: #5f6d7e;
}

#footer p.copyright-text a:hover {
  color: #6cc0f7;
}

<!DOCTYPE html>

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Autoservis Ji?í Baloun</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <link rel="stylesheet" href="css/normalize.css">
  <link rel="stylesheet" href="css/font-awesome.css">
  <link rel="stylesheet" href="css/bootstrap.min.css">
  <link rel="stylesheet" href="css/styles.css">
  <script src="js/vendor/modernizr-2.6.2.min.js"></script>
</head>

<body>
  <!-- SIDEBAR -->
  <div class="sidebar-menu hidden-xs hidden-sm">
    <div class="top-section">
      <div class="profile-image">
        <img src="img/profile.jpg">
      </div>
      <h3 class="profile-title" align="center">Autoservis Ji?í Baloun</h3>
      <!-- <p class="profile-description">Digital Photography</p> -->
    </div>
    <!-- top-section -->
    <div class="main-navigation">
      <ul class="navigation">
        

Answer 1

Use this:

.social-icons {
    padding: 30px 40px;
    position: absolute;
    bottom: 0;
    margin: auto;
    text-align: center;
    width: 100%;
    left: 0;
    right: 0;
}