Flockingbird/roost

.is-vertical-center {
  display: flex;
  align-items: center;
}

.is-horizontal-center {
  justify-content: center;
}

.navbar,
.navbar-start {
  display: flex;
}

.navbar .navbar-item {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.masthead {
  background-image: url('https://placekitten.com/400/300');
  background-repeat: no-repeat;
  background-position: top;
  background-attachment: fixed;
  background-size: 100% auto;
  height: 200px;
  margin: -48px -24px -24px -24px;
}

.profile-card {
  background: white;
  padding: 24px;
  margin: 0 -24px 0 -24px;
  border-radius: 24px 24px 0 0;
}

.profile-card .avatar {
  margin-top: -72px; /* 24+(96÷2) */
}

.profile-card .avatar img {
  border: 2px solid white;
}