:root { /* light theme color */ --background: #fff; --background-secondary: #eaeaea; --header: #fafafa; --color: #222; --color-secondary: #999; --border-color: #dcdcdc; /* variables for js, must be the same as these in @custom-media queries */ --phoneWidth: (max-width: 684px); --tabletWidth: (max-width: 900px); } body.dark-theme { /* dark theme colors */ --background: #292a2d; --background-secondary: #3b3d42; --header: #252627; --color: #a9a9b3; --color-secondary: #73747b; --border-color: #4a4b50; } @custom-media --phone (width < 684px); @custom-media --tablet (width < 900px); @define-mixin greater-icon $stroke-width: 3px, $width: .95rem, $height: 100% { .greater-icon { width: $width; height: $height; path { stroke: currentColor; stroke-width: $stroke-width; } } } /* HOW TO USE */ /*@media (--phone) {*/ /*margin-top: 0;*/ /*}*/