#navbar-main {
  /* Added `.affix-top` class css when the element is top */
  /* Added `.affix` class css when the element is >= 170px (Look: line 8 html) */
  /* Added `.affix-bottom` class css when the element is footer */
}
#navbar-main.affixed-top {
  background: black;
}
#navbar-main.affix {
    background: rgba(31,31,31,0.8);
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0px 0 10px;
}
#navbar-main.affix-bottom {
  background: red;
}
.navbar-inverse {
    background-color: transparent;
    border-color: transparent;
}
.navbar-nav {
    float: none;
    margin: 0 auto;
    display: block;
    text-align: center;
}
.navbar-nav > li {
    float: none;
    display: inline-block;
    margin-left: 20px;
  margin-right: 20px;
}
.navbar-inverse .navbar-nav > li > a {
    color: #fff;
    font-family: 'Newcas', sans-serif;
    font-size: 20px;
    text-transform: uppercase;
    opacity: 0.8;
}
/* Not important */
.footer {
  background: #eee;
  height: 1000px;
}