.multi-figures {
  display: flex;
  flex-wrap: wrap;
  gap: 1%;               /* space between images */
  margin: 0 auto;
}

.multi-figures figure {
  margin: 0;
}

.multi-figures img {
  width: 100%;            /* fill the figure */
  height: auto;
  display: block;
  border-radius: 4px;
}