message: style(example): provider mobile layout
diff: .providerflow {
  + flex-direction: column;
  display: flex;
  height: 100%;
  }
  .providerflow aside {
  - width: 20%;
  - max-width: 250px;
  - flex-grow: 1;
  border-right: 1px solid #eee;
  - padding: 10px;
  + padding: 15px 10px;
  font-size: 12px;
  background: #fcfcfc;
  }
  .providerflow .selectall {
  margin-top: 10px;
  }
  +
  +@media screen and (min-width: 768px) {
  + .providerflow {
  + flex-direction: row;
  + }
  +
  + .providerflow aside {
  + width: 20%;
  + max-width: 250px;
  + }
  +}
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