how to remove on click outline in html from a button code example

Example 1: how to get rid of button outline when clicked

*:focus {
    outline: 0 !important;
}

Example 2: how to fix the button outline onclick

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