html,
body {
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
}
body {
  background: #7fffd4;
  font-family: 'sans-serif', 'Menlo';
  font-weight: 800;
  color: #fff;
}
.container {
  flex: 1;
  justify-content: center;
  align-items: stretch;
  align-content: stretch;
}
.content {
  padding: 2rem 3rem;
}
.containerUpper {
  flex: 50;
  align-items: center;
  justify-content: center;
  background-color: #ff4500;
  width: 100%;
  font-size: 12rem;
}
.containerDowner {
  flex: 50;
  align-items: center;
  justify-content: center;
  background-color: #7fffd4;
  width: 100%;
  align-items: 'center';
  justify-content: 'center';
  font-size: 2rem;
  color: #fff;
}
p,
address,
footer {
  color: darkslategray;
}

header {
  display: flex;
  flex-wrap: wrap;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  align-content: center;
  width: 100%;
}

header > * {
  font-size: 0.75rem;
  flex: 1 0 auto;
  margin: 5px;
}

footer {
  font-size: 1rem;
}

@media only screen and (max-width: 600px) {
  .containerUpper {
    font-size: 5rem;
  }
  .containerDowner {
    font-size: 1rem;
  }
}