input[type='number'] {
    -moz-appearance:textfield;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}
td>input{
	width: 100%;
	height: 100%;
	padding: 0;
	margin: 0;
	border: none;
    outline: none;
	text-align: center;
	font-size: 2rem;
}
td>input:disabled{
	background-color: white;
	color: gray;
}
#sudoku{
	border-collapse: collapse;
}
#sudoku td{
	border: 1px solid black;
	height: 2em;
	width: 2em;
	font-size: 2em;
	font-family: sans-serif;
    text-align: center;
    line-height: 2em;
    overflow: hidden;
}
#sudoku tr:nth-child(3n){
	border-bottom: 3px solid black;
}
#sudoku tr:first-child{
	border-top: 3px solid black;	
}
#sudoku td:nth-child(3n){
	border-right: 3px solid black;
}
#sudoku td:first-child{
	border-left: 3px solid black;	
}
.grey{
	color: gray;
}
button{
	position: relative;
    overflow: hidden;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    z-index: 1;
    text-decoration: none;
    color: #fff;
    background-color: #263238;
    text-align: center;
    letter-spacing: .5px;
    -webkit-transition: .2s ease-out;
    transition: .2s ease-out;
    cursor: pointer;
    font-size: 1rem;
    outline: 0;
	border: none;
    border-radius: 2px;
    display: inline-block;
    height: 36px;
    line-height: 36px;
    padding: 0 2rem;
    margin-top: .5rem;
    text-transform: uppercase;
    vertical-align: middle;
    -webkit-tap-highlight-color: transparent;
    -webkit-box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14), 0 1px 5px 0 rgba(0,0,0,0.12), 0 3px 1px -2px rgba(0,0,0,0.2);
    box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14), 0 1px 5px 0 rgba(0,0,0,0.12), 0 3px 1px -2px rgba(0,0,0,0.2);
}
button:hover{
	-webkit-box-shadow: 0 3px 3px 0 rgba(0,0,0,0.14), 0 1px 7px 0 rgba(0,0,0,0.12), 0 3px 1px -1px rgba(0,0,0,0.2);
    box-shadow: 0 3px 3px 0 rgba(0,0,0,0.14), 0 1px 7px 0 rgba(0,0,0,0.12), 0 3px 1px -1px rgba(0,0,0,0.2);
}}