.sponsors {
  margin: 0 auto; 
  overflow: hidden; 
  position: relative;
  background: white;
  left: 10px;
}

.sponsorgallery {
  position: relative;
  margin: 0 auto;  
  left: 0; 
  top: 0;
}

.sponsorgallery li {
  float: left;
  background-color: white;
  margin: 0 auto;
}