body {
  padding-top: 5rem;
}
.starter-template {
  padding: 3rem 1.5rem;
  text-align: center;
}

.sponsors {text-align:center;}

.sponsors img{padding:30px; min-width: 30%; max-width:300px!important; margin:5px;}

.speakers img{min-width: 100px!important;}