html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  margin: 0;
  width: 100%;
  height: 100%;
}

h1 {
  font-size: 3rem;
}

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

.img--rounded {
  border-radius: 50%;
  margin: 1rem;
  padding: .2rem;
  background-color: rgb(255,255,255);
  border: 1px solid rgb(30,30,30);
}

.content {
  height: 100%;
  flex-direction: column;
  display: flex;
  justify-content: center;
  align-items: center;
}
.content--header {
  padding: 1rem;
}
.content--h1 {
  margin-top: .25rem;
  margin-bottom: .25rem;
}
.content--link {
  padding: .25rem;
}
.content--footer {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  margin: 0;
  width: 100%;
  height: 100%;
}

h1 {
  font-size: 3rem;
}

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

.img--rounded {
  border-radius: 50%;
  margin: 1rem;
  padding: .2rem;
  background-color: rgb(255,255,255);
  border: 1px solid rgb(30,30,30);
}

.wrapper {
  height: 100%;
}

.content {
  height: 100%;
  flex-direction: column;
  display: flex;
  justify-content: center;
  align-items: center;
}
.content--header {
  padding: 1rem;
}
.content--h1 {
  margin-top: .25rem;
  margin-bottom: .25rem;
}
.content--link {
  padding: .25rem;
}
.content--footer {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

Fix height of wrapper div
Fix height of wrapper div
