css remove button contour click code example

Example 1: how to remove button decoration

button {
    border: none;
}

button:focus {
    border: none;
    outline: none;
}

button:focus{
    outline:none !important;
}
(add !important if it is used in Bootstrap)

Example 2: remove outline on button click

using outline:none; we can remove that border in chrome

for tailwind css :
outline-none 
focus:outline-none