d3_demo.css

body {
    background: #fff;
    color: #757575;
    font-family: 'Open Sans', sans-serif;
    font-size: 12px;
}

img {
    max-width: 100%
}

h1 {
    font-size: 24px;
    font-weight: 600;
    text-transform: uppercase;
    color: #000;
    margin-bottom: 24px;
}

h3 {
    font-size: 1.4em;
    text-transform: uppercase;
    color: #000;
    margin-top: 0;
}

p, a {
    line-height: 1.7em;
    font-weight: lighter;
    letter-spacing: 1px;
    font-size: 16px;
}

li {
    padding: 7px 0;
}

.navbar {
    min-height: 60px;
}

.navbar-inverse {
    background-image: none;
    background-color: #1c262f;
    border-color: #1c262f;
}

.logo {
    max-width: 207px;
    max-height: 50px;
}

.main {
    margin-bottom: 24px;
}

.main-title {
    text-align: center;
}

.footer {
    background-color: #f4f4ef;
    padding: 24px 15px 36px;
}

.footer-header {
    font-weight: normal;
    color: #757575;
}

nav.social {
    clear: both;
    padding-top: 24px;
}

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

nav.social ul.social_links li {
  display: inline-block;
}

nav.social ul.social_links li a {
  display: block;
  width: 22.5px;
  height: 22.5px;
  margin-right: 18px;
  line-height: 0;
  opacity: .6;
  transition: opacity .3s ease;
}