sass/base/_color.scss
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 $color-background: #eee !default;
 $color-main: #258fb8 !default;
 $color-gray01: #666 !default;
 $color-gray02: #999 !default;
 $color-gray03: #ccc !default;
 $color-gray04: #ddd !default;
 $color-gray05: #fff !default;