How to set the indent for the entire row?

Question

Layout

With the help of flexbox, I made it so that the blocks wrap to a new line. How can I add margin-top for all bottom row blocks?

ul
    display: flex
    flex-wrap: wrap
    li
      margin-right: 20px
      width: 190px
      height: 100px

Answer 1

ul {margin-top: -20px;}
ul li {margin-top: 20px;