* {
    box-sizing: border-box;
}
html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}
body {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: #1a1a2e;
    color: #e0e0e0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.board {
    width: min(90vw, 90vh, 500px);
    max-width: 100%;
}
.info {
    width: min(90vw, 500px);
    max-width: 100%;
    margin-top: 20px;
    padding: 15px;
    background: #2a2a4e;
    border-radius: 10px;
}
.info select {
    padding: 8px 15px;
    border-radius: 5px;
    border: none;
    background: #3a3a5e;
    color: #e0e0e0;
    cursor: pointer;
}
.info span {
    display: inline-block;
    margin-top: 8px;
}
.move-history {
    max-height: 100px;
    overflow-y: auto;
    margin-top: 10px;
    padding: 10px;
    background: #1a1a2e;
    border-radius: 5px;
}