CSS

how to remove border on button click

.btnName{
	outline: none;
}

how to remove border in button html

padding: 0;
border: none;
background: none;

remove on click border

outline:none;

html button remove border on click

.x-btn:focus, .button:focus, [type="submit"]:focus {
   outline: none;
}

button remove border if click

<style>
input[type="button"]
{
    width:120px;
    height:60px;
    margin-left:35px;
    display:block;
    background-color:gray;
    color:white;
    border: none;
    outline:none;
}
</style>

remove clicked button border

<button style="outline: none;"></button>

remove outline on button click

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

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