css justify boxes simplified

HTML

<div class="container">
   <div>Box1</div>
   <div>Box2</div>
   <div>Box3</div>
   <div>Box4</div>
</div>

CSS

* {
  margin: 0;
  padding: 0;
}
.container {
  background: orange;
  overflow: auto;
  display: block;
  min-width: 150px;
}
.container > div {
  margin-bottom: 20px;
  width: 150px;
  height: 100px;
  background: blue;
  float: left;
  color: #fff;
  text-align: center;
}
@media (max-width: 350px) {
  .container > div {
    margin-left: calc(((100% - 150px)/2) - 1px);
    margin-right: calc(((100% - 150px)/2) - 1px);
    background:black;
  }
}

@media (min-width: 350px) and (max-width: 550px) {
  .container > div {
    margin-right: calc((100% - 300px) - 1px);
    background:red;
  }
  .container > div:nth-child(2n) {
    margin-right: 0;
  }
}
@media (min-width: 550px) and (max-width: 750px)  {
  .container > div {
     margin-right: calc(((100% - 450px) / 2) - 1px);
    background:purple;
  }
  .container > div:nth-child(3n) {
    margin-right: 0;
  }
}

@media (min-width: 750px){
  .container > div {
    margin-right: calc(((100% - 600px) / 3) - 1px);
  }
  .container > div:nth-child(4n) {
    margin-right: 0;
  }
}