Answers for "how to remove border from button css"

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)

remove button default border css

button:focus { outline: none; }

how to remove border on button click

.btnName{
	outline: none;
}

removing the unwanted border button css

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