body {
    -webkit-user-select: none;  /* Chrome, Safari, Opera */
    -moz-user-select: none;     /* Firefox */
    -ms-user-select: none;      /* Internet Explorer/Edge */
    user-select: none;          /* Non-prefixed version, currently supported by Chrome, Edge, Opera and Firefox */
}

/* Seçme ve kopyalama tamamen engellensin */
* {
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none;   /* Safari */
    -khtml-user-select: none;    /* Konqueror HTML */
    -moz-user-select: none;      /* Old versions of Firefox */
    -ms-user-select: none;       /* Internet Explorer/Edge */
    user-select: none;           /* Non-prefixed version, currently supported by Chrome, Edge, Opera and Firefox */
}
#timer-display {
    position: fixed;
    top: 10px;
    right: 10px;
    padding: 10px;
    background-color: red;
    color: white;
    font-weight: bold;
    z-index: 1000;
}