CSS

.MyFlexBlockContainer {
  width: 100%;
  display: flex;
  row-gap: 20px;
  column-gap: 20px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
}
.MyFlexBlockContainer a {
  display:contents;         /*Stop links adddign default display:block property and killing flexblock layout*/
}

.MyFlexObject {
  flex-basis: 360px;    /*Set the width*/
  flex-grow: 0;
  flex-shrink: 0;
}

HTML

  <div class="MyFlexBlockContainer">
    <div class="MyFlexObject">

    </div>
  </div>