JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wr">
  <div class="block block__6">БЛОК 6</div>
  <div class="block block__5">БЛОК 5</div>
  <div class="block block__4">БЛОК 4</div>
  <div class="block block__3">БЛОК 3</div>
  <div class="block block__2">БЛОК 2</div>
  <div class="block block__1">БЛОК 1</div>
</div>

CSS

.wr {
  display: flex;
  flex-flow: wrap-reverse;
  flex-direction: row-reverse;
}
.block {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-grow: 1;
  color: #fff;
  text-shadow: 1px 1px 2px #000;
  font-weight: bold;
  height: 50px;
  width: 33%;
}


.block__1 {
  background: #ff0000;
}
.block__2 {
  background: #00ff00;
}
.block__3 {
  background: #0000ff;
}
.block__4 {
  background: #ff00ff;
}
.block__5 {
  background: #00ffff;
}
.block__6 {
  background: #ffff00;
}

.wr__2 {
  margin-top: 50px;
}

@media (max-width: 600px){
  .block {
   width: 25%; 
   }
  .block__1 {
    order: -1;
  }
}