.text-center {
  text-align: center;
}

p {
  display: inline-block;
  font-size: 18px;
}

h1 {
  font-size: 38px;
}

html {
  background-color: #ffffff;
}

body {
  margin-top: 50px;
}

.flex-container {
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
  align-items: center;
}

.flex-container > div {
  flex: 1;
  margin: 10px;
  padding: 10px;
}

.flex-container > .main {
  flex: 2 2 400px;
}