@yandex/ui/Button/_theme/Button_theme_action@desktop.css

Yandex UI components

.Button2_theme_action::before {
    transition: background-color .1s ease-out 0s;
}

.Button2_theme_action:not([aria-disabled='true']):hover::before,
.Button2_theme_action.Button2_hovered::before {
    background-color: #ffd633;
}

.utilityfocus .Button2_theme_action:not([aria-disabled='true']):focus::before,
.utilityfocus .Button2_theme_action.Button2_focused::before {
    animation: button2-action-focus 1s infinite linear;
}

@keyframes button2-action-focus {
    from,
    to {
        background-color: #fc0;
    }

    40%,
    60% {
        background-color: #ffe066;
    }
}