message: Fixed: design for signin.
diff: /* ============================== */
  .EndpointsPage__signin {
  display: block;
  - width: 504px;
  }
  .EndpointsPage__signinTitle {
  margin-bottom: 24px;
  - font-size: 36px;
  + font-size: 24px;
  }
  .EndpointsPage__signinEmails {
  margin-top: 24px;
  }
  +.EndpointsPage__signinEmailsTitle {
  + font-weight: bold;
  + font-size: 16px;
  + margin-bottom: 8px;
  +}
  +
  .EndpointsPage__signinEmail {
  - @apply --layout-center-center;
  + display: block;
  margin-bottom: 12px;
  }
  .EndpointsPage__signinEmail .Textinput,
  .EndpointsPage__signinEmail .Button {
  display: block;
  + width: 100%;
  }
  .EndpointsPage__signinEmail .Textinput {
  - flex-grow: 1;
  - margin-right: 12px;
  -}
  -
  -.EndpointsPage__signinEmail .Button {
  - flex-shrink: 0;
  + margin-bottom: 8px;
  }
  .EndpointsPage__signinEmail:last-child {
  margin-top: 24px;
  }
  +.EndpointsPage__signinOauthsTitle {
  + font-size: 16px;
  + margin-bottom: 8px;
  + font-weight: bold;
  +}
  +
  .EndpointsPage__signinOauth {
  display: inline-block;
  margin-right: 12px;
  