div .container {
  width: 10px;
}
div .container .container {
  width: 10px;
  max-width: 12px;
}
div .container .foo {
  width: 10px;
}
div .container .bar {
  width: 12px;
}
@media print, screen and (min-width:640px) {
  .position-left {
    color: red;
    background: yellow;
  }
}
@media print, screen and (min-width:640px) {
  .element {
    float: left;
  }
}
.a {
  x: y;
}
.a .inner {
  x: y;
}