primevue-mirror/components/lib/buttongroup/style/ButtonGroupStyle.js

import BaseStyle from 'primevue/base/style';

const theme = ({ dt }) => `
.p-buttongroup .p-button {
    margin: 0;
}

.p-buttongroup .p-button:not(:last-child),
.p-buttongroup .p-button:not(:last-child):hover {
    border-right: 0 none;
}

.p-buttongroup .p-button:not(:first-of-type):not(:last-of-type) {
    border-radius: 0;
}

.p-buttongroup .p-button:first-of-type:not(:only-of-type) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.p-buttongroup .p-button:last-of-type:not(:only-of-type) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.p-buttongroup .p-button:focus {
    position: relative;
    z-index: 1;
}
`;

const classes = {
    root: 'p-buttongroup p-component'
};

export default BaseStyle.extend({
    name: 'buttongroup',
    theme,
    classes
});