How To Change Header Admin Link CSS

.admin-header-links {
  background-color: #333;
  text-align: center;
  color: #eee;
}

.admin-header-links * {
  display: inline-block;
  margin: 0 10px;
  line-height: 35px;
  font-size: 12px;
  font-weight: bold;
}

.admin-header-links .impersonate {
  display: inline-block;
}

.admin-header-links .impersonate a {
  background-color: #555;
  padding: 0 15px;
}

.admin-header-links .impersonate a:hover,
.admin-header-links .impersonate a:focus {
  background-color: #666;
}