body{
    font-family: "Roboto", sans-serif;
    margin-bottom: 40px;
    background-color:black;
    background-image:
    radial-gradient(white, rgba(255,255,255,.2) 2px, transparent 4px),
    radial-gradient(white, rgba(255,255,255,.15) 1px, transparent 3px),
    radial-gradient(white, rgba(255,255,255,.1) 2px, transparent 4px),
    radial-gradient(rgba(255,255,255,.4), rgba(255,255,255,.1) 2px, transparent 3px);
    background-size: 550px 550px, 350px 350px, 250px 250px, 150px 150px;
    background-position: 0 0, 40px 60px, 130px 270px, 70px 100px;
}
a {
    transition: opacity 0.2s;
}
a:hover{
    opacity: 0.8;
    text-decoration: none;
}
h2,h3{
    font-weight: 900;
}
header {
    height: 270px;
    background-image: url('ocsd_02_v02.png');
    background-repeat: none;
    background-position: center;
    margin-bottom: 15px;
    position: relative;
}
header .container {
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    bottom: 0;
}
.jumbotron { 
    align-items: stretch;
}
div.col {
    margin: 15px 0;
}
.item {
    height: 125px;
    padding: 10px 20px;
}