discourse/app/assets/stylesheets/desktop/login.scss

// -webkit- prefix needed for 
// flexbox on Safari 8
// can be removed once support
// for safari 8 is dropped

// shared styles used
// on both the login and
// create accont modals
.login-modal,
.create-account {
  #login-buttons:not(.hidden) {
    display: -webkit-flex;
    -webkit-flex-direction: column;
    -webkit-justify-content: center;
    -webkit-flex-basis: 50%;
    -webkit-align-items: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    flex-basis: 50%;
    align-items: center;
    min-height: 200px;
    border-left: 1px solid $primary-low;

    button {
      margin: 0.35em;
      width: 160px;
      &:lang(zh_CN) {
        min-width: 200px;
      }
    }
  }

  #login-form {
    -webkit-flex: 1 0 auto;
    flex: 1 0 auto;
    padding: 1em 0;
  }

  tr:not(.instructions) {
    td {
      display: -webkit-flex;
      display: flex;
      padding: 5px 0 0 0;
    }
  }

  tr.input label {
    margin-bottom: 0;
  }
}

// styles used on
// login modal only
.d-modal.login-modal {
  .modal-body,
  #credentials {
    display: -webkit-flex;
    -webkit-align-items: center;
    -webkit-justify-content: center;
    display: flex;
    align-items: center;
    justify-content: center;

    tr {
      display: -webkit-flex;
      -webkit-flex-direction: column;
      display: flex;
      flex-direction: column;
    }
  }
}

// styles used on the
// create account
// modal only
.d-modal.create-account {
  .modal-body {
    display: -webkit-flex;
    -webkit-justify-content: space-evenly;
    display: flex;
    justify-content: space-evenly;
  }

  .create-account-form tr {
    display: -webkit-flex;
    -webkit-flex-direction: column;
    display: flex;
    flex-direction: column;
  }

  .login-form {
    display: -webkit-flex;
    -webkit-flex-basis: 50%;
    -webkit-align-items: center;
    display: flex;
    flex-basis: 50%;
    align-items: center;

    tr:not(.password-confirmation) {
      display: -webkit-flex;
      -webkit-flex-direction: column;
      display: flex;
      flex-direction: column;
      margin-top: 0.15em;
    }
  }

  form {
    margin: 0 auto;
  }

  tr.input {
    input,
    label {
      margin-bottom: 0;
    }
    .tip {
      max-width: 340px;
    }
  }

  .tip {
    &:not(:empty) + td {
      display: none;
    }

    &:not(:empty),
    &:empty + td {
      min-height: 1.75em;
      width: 240px;
      font-size: $font-down-1;
    }
  }

  .invites-show {
    padding-top: 20px;

    .two-col {
      margin-top: 30px;
    }
    .col-image {
      width: 200px;
      img {
        width: 200px;
      }
    }
    .col-form {
      margin-left: 200px;
      .inline-invite-img {
        display: none;
      }
    }
    form {
      .controls,
      .input {
        margin-left: 20px;
      }
      input,
      label {
        margin-bottom: 0;
      }
      .user-field .control-label:not(.checkbox-label) {
        margin-left: 20px;
      }
    }
  }

  .password-reset,
  .invites-show {
    .col-form {
      padding-left: 20px;
    }
    h2 {
      margin-bottom: 12px;
    }
    .col-image img {
      width: 200px;
      height: 200px;
    }
  }

  .password-reset {
    .col-form {
      padding-top: 40px;
    }
  }

  .tos-agree {
    margin-bottom: 12px;
  }

  .disclaimer {
    margin-top: 15px;
  }

  .instructions {
    label {
      color: dark-light-choose($primary-medium, $secondary-medium);
    }
  }

  .user-fields {
    border-top: 1px solid $primary-low;
    padding-top: 20px;
  }
}