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admin/static/bootstrap/scss/variables/_variables.grid.scss

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+$xs: 300px !default;
+$sm: 400px !default;
+$md: 900px !default;
+$lg: 1200px !default;
+
+$grid-breakpoints: (
+   xs: 0,
+   sm: $sm,
+   md: $md,
+   lg: $lg
+) !default;
+
+$container-widths: (
+   sm: $sm - 20px,
+   md: $md - 20px,
+   lg: $lg - 20px
+) !default;
+
+
+$grid-columns:              12 !default;
+$grid-gutter-width:         30px !default;
+$gap-width:                 10px !default;
+
+// Navbar collapse
+//** Point at which the navbar becomes uncollapsed.
+$grid-float-breakpoint:     $sm !default;
+//** Point at which the navbar begins collapsing.
+$grid-float-breakpoint-max: ($grid-float-breakpoint - 1) !default;