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public/assets/bootstrap/scss/mixins/_container.scss

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+// Container mixins
+
+@mixin make-container($gutter: $container-padding-x) {
+  --#{$prefix}gutter-x: #{$gutter};
+  --#{$prefix}gutter-y: 0;
+  width: 100%;
+  padding-right: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  padding-left: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  margin-right: auto;
+  margin-left: auto;
+}