html, body {
    margin: 0; padding: 0;
}
.hero-bkg-animated {
    background: gray url(../images/congruent_pentagon.png) repeat 0 0;
    width: 100%;
    margin: 0;
    text-align: center;
    height: 150px;
    padding-top: 120px;
    box-sizing: border-box;
    -webkit-animation: slide 20s linear infinite;
}

.hero-bkg-animated h1 {
    font-family: sans-serif;
}

@-webkit-keyframes slide {
    from { background-position: 0 0; }
    to { background-position: -400px 0; }
}