.flex {
  display:flex;
  justify-content:center;
  align-items:center;
  flex-wrap:wrap;
}
.flex > DIV {
  flex: 1;
  min-width: 200px;
  margin:2px;
  padding:25px;
  background:#ccc;
  border:1px solid #bbb;
  font-size:12pt;
  color:#666;
}
body {
  color: #292929;
  font: 90% Roboto, Arial, sans-serif;
  font-weight: 300;
}
div#header {
  position: relative;
  max-width: 900px;
  margin: 20px auto;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
div#header h1 {
  height: 80px;
  line-height: 80px;
  margin: 0;
  padding-left: 0;
  text-align: center;
  background: #e0e0e0;
  color: #292929;
}
div#header a {
  position: absolute;
  right: 0;
  top: 23px;
  padding: 10px;
  color: #006;
}
div#header a.back {
  left: 0;
  right: auto;
}