%%html
<style>
.button_style{
    width:100%;
    border : 2px solid silver;
    height: 50px;
    background-color:red;
    color: blue;
    font-size: 24px;
    font-weight: bold;
}
</style>
		

button = widgets.Button(description='Click')
button.add_class('button_style')
display(button)
        

from ipywidgets import Layout
button = widgets.Button(description='Click', layout={'width':'50%', 'height':'80px'})
display(button)
        

from ipywidgets import Layout
button_layout=Layout(width='50%', height='80px')
button = widgets.Button(description='Click', layout=button_layout)
display(button)
        

button = widgets.Button(description='Click', button_style = 'info')
display(button)
        

button = widgets.Button(description='Click')
button.style.button_color = 'silver'
display(button)