body {
    margin: 0;
    padding: 0;
    background: #f8f9fa;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    font-family: Arial, Helvetica, sans-serif;
}
#canvas-container {
    width: 100%;
    max-width: 720px;
    position: relative;
}
canvas { display: block; }
#own-input {
    position: absolute;
    bottom: 46px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 8px;
    font-size: 13px;
    border: 1px solid #999;
    border-radius: 4px;
    width: 200px;
    display: none;
}