@import url('https://fonts.googleapis.com/css2?family=Montserrat&display=swap');


body {
	margin: 0;
	padding: 0;
}

button, h1 {
	margin-left: auto;
	margin-right: auto;
	text-align: center;
	font-family: Montserrat, Arial, Helvetica, sans-serif;


}

.sudoku-menu {
	width: 50%;
	text-align: center;
	margin-left: auto;
	margin-right: auto;
}

.sudoku-menu button {
	font-size: 24px;
	margin: 10px;
	padding: 5px;
}

.sudoku-container {
	border: 5px solid #666;
	margin-left: auto;
	margin-right: auto;
}

.sudoku-container td {
	margin: 0;
}
.sudoku-container input {
	width: 40px;
	height: 40px;
	text-align: center;
	font-size: 20px;
	padding: 0;
	border: 1px #ccc solid;
	background: transparent;
}

.sudoku-container .sudoku-input-error {
	background: #ffc9d7;
}
.sudoku-container.valid-matrix {
	border: 5px solid #7edb37;
}


.sudoku-section-one {
	background: #ccc;
}


#article {
	font-family: Montserrat, Arial, Helvetica, sans-serif;
	padding: 7% 10% 0 10%;
}