body {
  background: #fff;
}
.sign-item {
  display: flex;
  align-items: center;
}
#main {
  flex-grow: 1;
}
#main > .card > .card-body {
  margin: 16px 24px;
}
#main h2 {
  margin-bottom: 24px;
}
.form-signin {
  display: flex;
  height: 100%;
  max-width: 330px;
  flex-direction: column;
  justify-content: center;
}
.form-signin a img {
  border: solid 1px #ddd;
  border-radius: 21px;
}
.form-signin .logo {
  font-size: 2em;
  padding: 2vh 0 6vh;
  display: flex;
  justify-content: center;
  align-items: center;
}