remove outline on button css code example

Example 1: diable focus button css

*:focus {
    outline: 0 !important;
}

Example 2: how to remove border from selected button

outline: none;

Example 3: css remove button outline

button:focus {outline:0;}

Example 4: remove button outlines

<button class="btn shadow-none">Bootstrap (4.1) button without shadow</button>