h2 {
  margin-bottom: 10px;
}
img {
  margin: 10px 0;
  width: 100%;
}
.kerbal-index {
  display:flex;
  width: 100%;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-content: flex-start;
  align-items: flex-start;
}
.kerbal-index article {
  padding-bottom: 40px;
  flex-grow: 1;
  flex-shrink: 0;
  flex-basis: 300px;
}
.kerbal-index article:nth-child(even) {
  padding-left: 10px;
}
.kerbal-index article:nth-child(odd) {
  padding-right: 10px;
}

@media(max-width: 840px) {
  .kerbal-index {
    display: block;
    width: auto;
  }
  .kerbal-index article {
    padding-left: 0 !important;
    padding-right: 0 !important;
  }
}