(fix) base styles adjustments

apps/block_scout_web/assets/css/theme/_neutral_variables.scss

@@ -3,3 +3,5 @@ $secondary: #687bf6;
 $tertiary: #687bf6;
 
 $base-border-color: #e2e5ec !default;
+
+$dashboard-line-color-price: #8286a9;

apps/block_scout_web/assets/css/theme/_variables.scss

@@ -11,7 +11,7 @@
 // @import "musicoin_variables";
 // @import "pirl_variables";
 // @import "poa_variables";
-@import "posdao_variables";
+// @import "posdao_variables";
 // @import "rinkeby_variables";
 // @import "ropsten_variables";
 // @import "social_variables";