Button background-color via css - still problematic

What’s the proper styling?

btn_run = Button(label='execute', css_classes=['btn_style'])

.btn_style {
    background-color: #05b7ff !important;
}

See my comment here: RadioButtonGroup - title, how to? - #4 by Bryan re: how to help others help you

Both are my posts. For this one I’ve found the solution.

.bk-root .btn_style .bk-btn-default {
    background-color: #B0C4DE !important;
    border-color: #adadad !important;
    box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125) !important;
}

.bk-root .btn_style .bk-btn-default:hover {
    background-color: #ebebeb !important;
    border-color: #adadad !important;
}

.bk-root .btn_style .bk-btn:active {
    background-color: #f5f5f5 !important;
}