body {font-family:sans-serif;}

.import {padding-bottom:0.2em;}
.import input[type=text] {width:630px;}

.valid {background-color:limegreen;}
.invalid {background-color:red;}
.sameNumber {background-color:lightgray;}
.imported_square {background-color:lightgray;}

.sudoku {border:4px solid black; border-collapse: collapse;}
.sudoku tr {padding:0;}
.sudoku td {padding:0; border:1px solid black; width:1em;}
.sudoku input {width:1em; border:0; font-size:15pt; text-align:center;}
.sudoku .thick_right {border-right:4px solid black !important;}
.sudoku .thick_bottom {border-bottom:4px solid black;}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Firefox */
input[type=number] {
  -moz-appearance: textfield;
}


button {font-size : 15px;}