gnome-shell-dark-theme/gnome-shell-sass/widgets/_login-lock.scss

$_gdm_bg: $system_bg_color;
$_gdm_fg: $system_fg_color;
$_gdm_dialog_width: 23em;

// common style for gdm and lockscreen
.login-dialog,
.unlock-dialog {

  .caps-lock-warning-label,
  .login-dialog-message-warning {
    color: $_gdm_fg;
  }
}

/* Login Dialog */
.login-dialog {
  background-color: $_gdm_bg;
}

// buttons
.login-dialog-button {

  &.cancel-button,
  &.switch-user-button,
  &.login-dialog-session-list-button {
    @extend .icon-button;
    @extend %system_button;
  }

  &.cancel-button {
    padding: $base_padding*1.5;
  }
}

.login-dialog-button-box {
  width: $_gdm_dialog_width;
  spacing: $base_padding*2;
}

.login-dialog-logo-bin {
  margin:3em 0;
}
.login-dialog-banner { color: darken($_gdm_fg,10%); }
.login-dialog-banner-view { max-width: $_gdm_dialog_width; }
.login-dialog-message { text-align: center; }
.login-dialog-user-selection-box { padding: 100px 0px; }

.login-dialog-not-listed-label {
  @include fontsize($base_font_size);
  font-weight: bold;
  color: darken($_gdm_fg,30%);
  padding: $base_padding*2;

  .login-dialog-not-listed-button:focus &,
  .login-dialog-not-listed-button:hover & {
    color: $_gdm_fg;
  }
  .login-dialog-not-listed-button:focus & {
    text-decoration: underline;
  }
}

.login-dialog-auth-list-view { -st-vfade-offset: 1em; }
.login-dialog-auth-list {
  spacing: 6px;
  margin-left: 2em;
}
.login-dialog-auth-list-title {
  margin-left: 2em;
}

.login-dialog-auth-list-item {
  border-radius: $base_border_radius*2;
  padding: 4px;
  color: darken($_gdm_fg,30%);

  &:focus, &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

.login-dialog-auth-list-label {
  @include fontsize($base_font_size + 2);
  font-weight: bold;
  padding-left: 15px;

  &:ltr { padding-left: 14px; text-align: left; }
  &:rtl { padding-right: 14px; text-align: right; }
}

.login-dialog-user-list-view { -st-vfade-offset: 1em; }

.login-dialog-user-list {
  spacing: 12px;
  width: $_gdm_dialog_width;

  .login-dialog-user-list-item {
    border-radius: $base_border_radius + 4px;
    padding: $base_padding;
    background-color: transparentize($_gdm_fg, .95);
    color: $_gdm_fg;

    @if $is_highcontrast {
      box-shadow:inset 0 0 0 1px $hc_inset_color;;
    }
    .user-widget .user-icon {
      border: 4px solid transparent;
    }

    .login-dialog-timed-login-indicator {
      height: 2px;
      margin-top: 6px;
      background-color: darken($_gdm_fg, 30%);
    }

    &:focus .login-dialog-timed-login-indicator { background-color: $selected_fg_color; }
  }

  &:expanded .login-dialog-user-list-item {
    transition-duration: 300ms;
    transition-timing-function: ease;

    &:hover {
      background-color: transparentize($_gdm_fg, .9);
      color: $_gdm_fg;
    }

    &:selected {
      background-color: $selected_bg_color;
      color: $selected_fg_color;
      &:hover { background-color: lighten($selected_bg_color,5%); }
    }

    &:logged-in {
      .user-widget .user-icon {
        border-color: $selected_bg_color;
      }
    }
  }
}

.login-dialog-prompt-layout {
  spacing: $base_padding*2;
  width: 26em;
}

.login-dialog-prompt-entry {
  @extend %system_entry;
}


/* Screen Shield */
// a.k.a. the lockscreen

.unlock-dialog {
  background-color: transparent;

  // %system_entry style override to have neutral focus color with wallpaper background
  .login-dialog-prompt-entry {
    &:focus { @include entry(focus, $c:$system_fg_color, $fc:transparentize($system_fg_color, 0.5));}
  }
}

.screen-shield-background { // just the shadow, really
  background: black;
  box-shadow: 0 2px 4px rgba(0,0,0,0.6);
}

#lockDialogGroup {
  background-color: $_gdm_bg;
}

// Clock
.unlock-dialog-clock {
  color: $_gdm_fg;
  spacing: 2em;

  .unlock-dialog-clock-time {
    @extend %numeric;
    @include fontsize(72);
    font-weight: 200;
  }

  .unlock-dialog-clock-date {
    @extend %title_1;
    font-weight: 400;
  }

  .unlock-dialog-clock-hint {
    margin-top: 2em;
    padding: $base_padding $base_padding*3;
    border-radius: $base_border_radius*2;
    font-weight: bold;
  }
}

// Notifications
#unlockDialogNotifications {
  StButton#vhandle, StButton#hhandle {
    background-color: transparentize($bg_color,0.7);
    &:hover, &:focus { background-color: transparentize($bg_color,0.5); }
    &:active { background-color: transparentize($selected_bg_color,0.5); }
  }
}

.unlock-dialog-notifications-container {
  margin: 12px;
  spacing: 6px;
  width: $_gdm_dialog_width;
  background-color: transparent;

  .summary-notification-stack-scrollview {
    padding-top: 0;
    padding-bottom: 0;
  }

  .notification,
  .unlock-dialog-notification-source {
    padding: 12px 16px;
    border: none;
    background-color: transparentize($_gdm_fg,0.9);
    color: $_gdm_fg;
    border-radius: $modal_radius;

    &.critical { background-color: transparentize($_gdm_fg,0.8) }
  }
}

.unlock-dialog-notification-label {
  padding-left: 12px;
  padding-right: 0;
  &:rtl { padding-right: 12px; padding-left: 0; }
}

.unlock-dialog-notification-count-text {
  font-weight: bold;
  padding: 0 12px;
  color: $_gdm_fg;
  background-color: transparentize($_gdm_fg, 0.9);
  border-radius: 99px;
}


// User Widget
.user-widget {

  .user-widget-label {
    color: $_gdm_fg;
  }

  // layout of the user list
  &.horizontal {
    spacing: $base_padding*3;
    .user-widget-label {
      @extend %title_3;
    }

    .user-icon {
      & StIcon {
        padding: 12px;
        icon-size: $base_icon_size*2;
        width: $base_icon_size*3;
        height:  $base_icon_size*3;
        background-color: transparentize($_gdm_fg, 0.9);
      }
    }
  }

  // layout of the login prompt
  &.vertical {
    spacing: $base_padding*4;

    .user-widget-label {
      @extend %title_1;
      text-align: center;
      margin-bottom: .75em;
    }

    .user-icon {
      icon-size: $base_icon_size*10;

      & StIcon {
        padding: 32px;
        icon-size: $base_icon_size*4;
        background-color: transparentize($_gdm_fg, 0.9);
      }
    }
  }
}