wagtail/client/scss/layouts/_login.scss

// overrides default nice padding defined in variables.scss
$desktop-nice-padding: 100px;

.login,
.login .content-wrapper {
  background-color: $color-grey-1;
  color: $color-grey-3;
}

.login {
  margin-inline-start: 0;
  height: 100%;

  .content-wrapper {
    border: 0;
  }

  .wrapper {
    padding-inline-start: $mobile-nice-padding;
    padding-inline-end: $mobile-nice-padding;
    margin-inline-start: 0;
    max-width: none;
  }

  h1 {
    font-weight: 300;
    font-size: 2em;
    line-height: 1em;
    color: $color-white;
    white-space: nowrap;
  }

  form {
    width: 100%;

    ul {
      @include unlist();
    }
  }

  label {
    width: auto;
    color: $color-white;
  }

  .button,
  a.button {
    line-height: 1.2em;
    font-size: 1.5em;
    padding: 1.1em 2.4em;
    height: 3.5em;
  }

  .fields-wrapper {
    position: relative;
  }

  .fields {
    max-width: none;
  }

  .fields li {
    padding: 1em 0;

    &.full {
      position: relative;
      padding: 0;

      label {
        @include visuallyhidden;
      }

      input {
        border-top: 1px dashed $color-input-border;
      }
    }

    &:first-child input {
      border: 0;
    }
  }

  .fields .checkbox {
    padding-top: 2em;
    padding-bottom: 2em;
  }

  .field {
    padding: 0;
  }

  .iconfield .input:before {
    display: none;
  }

  // Special full-width, one-off fields i.e a single text or textarea input
  .full input {
    border-radius: 0;
    font-weight: 300;
    border: 0;
    padding: 1.5em $mobile-nice-padding 1.5em $mobile-nice-padding;
    font-size: 1.6em;
    line-height: 1.6em;
  }

  // Forgotten password link
  .help {
    font-size: 1.3em;
    margin-top: 0;
    padding: 10px 0;

    @include media-breakpoint-up(sm) {
      position: absolute;
      top: 139px;
      inset-inline-end: 5%;
      padding: 0;
    }

    &__link {
      color: $color-white;

      @include media-breakpoint-up(sm) {
        color: $color-link;
      }
    }
  }

  .messages {
    margin: 1em 0;
    z-index: 5;

    ul {
      margin: 0;

      &:before {
        display: none;
      }

      li {
        border-radius: 3px;
      }
    }
  }

  @include media-breakpoint-up(sm) {
    .content-wrapper {
      float: none;
      height: auto;
      width: 100%;
      display: inline-block;
      vertical-align: middle;
    }

    // centres login form vertically
    .wrapper {
      position: relative;
      height: 100%;
      padding: 0 $desktop-nice-padding;

      &:before {
        content: '';
        width: 0;
        display: inline-block;
        height: 100%;
        vertical-align: middle;
        margin-inline-start: -0.4em;
      }
    }

    h1 {
      font-size: 4em;
    }

    .full {
      margin: 0 (-$desktop-nice-padding);

      .iconfield {
        // stylelint-disable-next-line max-nesting-depth
        .input:before {
          display: inline-block;
          position: absolute;
          color: theme('colors.grey.200');
          border: 2px solid theme('colors.grey.200');
          border-radius: 100%;
          width: 1em;
          height: 1em;
          padding: 0.3em;
          inset-inline-start: $desktop-nice-padding;
          margin-top: -1.1rem;
          top: 50%;
          font-size: 1.3rem;
        }

        // stylelint-disable-next-line max-nesting-depth
        input {
          padding-inline-start: ($desktop-nice-padding + 50px);
        }
      }
    }
  }
}