body {
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    text-align: center;
    padding: 30px;
}

h1 {
    color: #333333;
}

form {
    margin-bottom: 20px;
}

input[type="number"] {
    width: 60px;
    padding: 5px;
    font-size: 1em;
}

button {
    background-color: green;
	color: white;
	width: 150px;
    padding: 5px;
    font-size: 1em;
}

.brett {
    display: grid;
    margin: 0 auto;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    border: 2px solid #444444;
    width: max-content;
}

.feld {
    width: 50px;
    height: 50px;
    font-size: 28px;
    line-height: 50px;
    text-align: center;
    vertical-align: middle;
}

.hell {
    background-color: #f0d9b5;
}

.dunkel {
    background-color: #b58863;
}