clicked button shows black brorder code example
Example 1: how to remove outline on button
outline: none;
Example 2: 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>