ul#fwall {
  display: flex;
  flex-wrap: wrap;
  padding: 0;
  list-style-type: none;
}
ul#fwall li {
  height: 195px;
  flex-grow: 1;
  margin: 0; /* To reset value set in my global stylesheet */
}
ul#fwall li:last-child {
  flex-grow: 10;
}
ul#fwall img {
  max-height: 100%;
  min-width: 100%;
  object-fit: cover;
  vertical-align: bottom;
}