$dark: #141316; $dark-2: #231f20; $yellow: #efd645; $green: #92e1b2; $red: #ff4e57; $colors: "red" $red, "white" #fff, "baltic-sea" #2a282d, "bossanova" #422654, "amaranth" #f23c57, "yellow" $yellow, "green" $green, "dark" $dark; $slideResp: true; $color-list:(); @for $i from 1 through length($colors) { $color-list: append($color-list, '.btn-' + nth(nth($colors,$i),1) ); }