How to remove outline border from input button

Using outline: none; you can remove that border in chrome.

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

Focus outline in Chrome and FF:

removed button focus outline:

input[type=button] {
  outline:none;
}
input[type=button]::-moz-focus-inner {
  border: 0;
}

/*
  Accessibility (A11Y)
  Don't forget! User accessibility is important
*/
input[type=button]:focus {
  /* your custom focused styles here */
} 

It works for me simply :)

*:focus {
    outline: 0 !important;
}

This one worked for me

button:focus {
    border: none;
    outline: none;
}