input above the label\n  > .custom-file .custom-file-input:focus {\n    z-index: 4;\n  }\n\n  > .form-control,\n  > .custom-select {\n    &:not(:first-child) { @include border-left-radius(0); }\n  }\n\n  // Custom file inputs have more complex markup, thus requiring different\n  // border-radius overrides.\n  > .custom-file {\n    display: flex;\n    align-items: center;\n\n    &:not(:last-child) .custom-file-label,\n    &:not(:last-child) .custom-file-label::after { @include border-right-radius(0);...