body { margin: 0; overflow: hidden; }
canvas { display: block; }
@media only screen and (max-width: 767px) {
    .zoom-button {
        display: block;
        position: fixed;
        bottom: 10px;
        width: 60px;
        height: 60px;
        margin: 5px;
        background-color: rgba(255, 255, 255, 0.2);
        color: white;
        border: none;
        border-radius: 50%;
        font-size: 24px;
        text-align: center;
        line-height: 50px;
        cursor: pointer;
        z-index: 1000;
        user-select: none;
        -webkit-user-select: none;
        -ms-user-select: none;
    }
    #zoom-in {
        right: 65px;
    }
    #zoom-out {
        right: 0px;
    }
}
@media only screen and (min-width: 768px) {
    .zoom-button {
        display: none;
    }
}
.debug-info {
    position: fixed;
    top: 10px;
    right: 10px;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 10px;
    border-radius: 5px;
    font-family: Arial, sans-serif;
    font-size: 14px;
    z-index: 1000;
}