Base sass variables file I like to use on my projects

_variables.scss

//Fonts
$font-main: 'Interstate-Regular';
$font-secondary: 'proximanova';

// Colors
$color-black: #000;
$color-white: #fff;

// Main Colors
$color-primary: #787772;
$color-secondary: #222;
$color-tertiary: #111;
$color-alternate: #000;

// Tonals
$color-light: #fff;
$color-medium: #D8D9D9;
$color-dark: #333;

// Breakpoints
$screen-xs: 320px;
$screen-sm: 640px;
$screen-md: 768px;
$screen-lg: 1024px;
$screen-xlg: 1248px;