transparent;\n  border: solid transparent;\n  border-width: $input-border-width 0;\n\n  &.form-control-sm,\n  &.form-control-lg {\n    padding-right: 0;\n    padding-left: 0;\n  }\n}\n\n\n// Form control sizing\n//\n// Build on `.form-control` with modifier classes to decrease or increase the\n// height and font-size of form controls.\n//\n// Repeated in `_input_group.scss` to avoid Sass extend issues.\n\n.form-control-sm {\n  height: $input-height-sm;\n  padding: $input-padding-y-sm $input-padding-x-sm;\n...