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