💄 Finished the common style settings.

assets/css/_variables/Gemini.scss

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+// Variables of Gemini scheme
+// ==================================================
+
+@import 'Pisces';
+
+// Settings for some of the most global styles.
+// --------------------------------------------------
+$body-bg-color           : #eee;
+
+// Borders.
+// --------------------------------------------------
+$box-shadow-inner        : 0 2px 2px 0 rgba(0, 0, 0, .12), 0 3px 1px -2px rgba(0, 0, 0, .06), 0 1px 5px 0 rgba(0, 0, 0, .12);
+$box-shadow              : 0 2px 2px 0 rgba(0, 0, 0, .12), 0 3px 1px -2px rgba(0, 0, 0, .06), 0 1px 5px 0 rgba(0, 0, 0, .12), 0 -1px .5px 0 rgba(0, 0, 0, .09);
+
+$border-radius-inner     : initial;
+$border-radius           : initial;
+// $border-radius-inner     : 0 0 3px 3px;
+// $border-radius           : 3px;

assets/css/_variables/Pisces.scss

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+// Variables of Pisces scheme
+// ==================================================
+
+// Settings for some of the most global styles.
+// --------------------------------------------------
+$body-bg-color                : #f5f7f9;
+
+$sidebar-width                : if(type-of($cfg_sidebar_width) == number, $cfg_sidebar_width, 240);
+$sidebar-desktop              : $sidebar-width * 1px;
+$content-wrap                 : calc(100% - #{$sidebar-width + $sidebar-offset});
+
+$content-desktop              : calc(100% - #{$content-desktop-padding / 2});
+$content-desktop-large        : 1160px;
+$content-desktop-largest      : 73%;
+
+
+// Borders
+// --------------------------------------------------
+$box-shadow-inner                 : initial;
+$box-shadow                       : initial;
+
+$border-radius-inner              : initial;
+$border-radius                    : initial;
+
+
+// Header
+// --------------------------------------------------
+$subtitle-color                   : $grey-lighter;
+
+// Sidebar
+// --------------------------------------------------
+$sidebar-nav-color                : var(--text-color);
+$sidebar-nav-hover-color          : $orange;
+$sidebar-highlight                : $orange;
+
+$site-author-image-width          : 120px;
+$site-author-image-border-width   : 1px;
+$site-author-image-border-color   : $gainsboro;
+
+$site-author-name-margin          : 0;
+$site-author-name-color           : var(--text-color);
+$site-author-name-weight          : 600;
+
+$site-description-font-size       : $font-size-smaller;
+$site-description-color           : $grey-dark;
+$site-description-margin-top      : 0;
+
+$site-state-item-count-font-size  : $font-size-medium;
+$site-state-item-name-font-size   : $font-size-smaller;
+$site-state-item-name-color       : $grey-dark;
+
+
+// Components
+// --------------------------------------------------
+
+// Button
+$btn-default-radius           : 2px;
+$btn-default-bg               : white;
+$btn-default-color            : $text-color;
+$btn-default-border-color     : $text-color;
+$btn-default-hover-bg         : $black-deep;
+$btn-default-hover-color      : white;
+
+// Back to top
+$b2t-opacity                  : .6;
+$b2t-opacity-hover            : .8;
+$b2t-position-bottom          : -100px;
+$b2t-position-bottom-on       : 30px;