how to remove border from button css 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 button default border css

button:focus { outline: none; }

Example 3: removing the unwanted border button css

button,
button:active,
button:focus {
  outline: none;
}

Example 4: how to remove outline on button

outline: none;