ul.balanced-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

ul.balanced-logos.grey {
  filter: grayscale(1);
}
  
ul.balanced-logos li {
  margin: 15px 30px;
  text-align: center;
  display: none;
}
  
ul.balanced-logos li img {
  display: block;
}
  
.dark ul.balanced-logos {
  filter: grayscale(1) invert(1) brightness(2);
  opacity: 0.65;
}
  
@media only screen and (max-width: 600px){
  ul.balanced-logos li {
    margin: 10px 10px;
  }
}