* {
  box-sizing: border-box;
}

html {
  position: relative;
  min-height: 100%
}

body {
  background: linear-gradient(to bottom, #f0f0ff, #c8c8ff);
  color: #222;
  font-family: 'Cabin', sans-serif;
  margin-bottom: 40px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'BioRhyme', serif;
} 

.footer {
  background: #ddd;
  bottom: 0;
  color: #444;
  font-size: 86%;
  height: 40px;
  line-height: 40px;
  position: absolute;
  width: 100%;
}

.tweet {
  background: #ddd;
  border: 1px solid #aaa;
  border-radius: 0.25em;
  padding: 0.5em;
  margin: 0.5em;
}

.tweet__content {
  white-space: pre-wrap;
}

.tweet__email, .tweet__time {
  font-size: 85%;
  color: #555;
}

* {
  box-sizing: border-box;
}

html {
  position: relative;
  min-height: 100%
}

body {
  background: linear-gradient(to bottom, #f0f0ff, #c8c8ff);
  color: #222;
  font-family: 'Cabin', sans-serif;
  margin-bottom: 40px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'BioRhyme', serif;
} 

.footer {
  background: #ddd;
  bottom: 0;
  color: #444;
  font-size: 86%;
  height: 40px;
  line-height: 40px;
  position: absolute;
  width: 100%;
}

.tweet {
  background: #ddd;
  border: 1px solid #aaa;
  border-radius: 0.25em;
  padding: 0.5em;
  margin: 0.5em;
}

.tweet__content {
  white-space: pre-wrap;
}

.tweet__email, .tweet__time {
  font-size: 85%;
  color: #555;
}

.toggle-follow {
  width: 5.5em;
}

Make follow / unfollow button constant width.
Make follow / unfollow button constant width.
