html,
body {
    width: 100%;
    height: 100%;
    margin: 0;

    /* Prevent document pinch-zoom & touch-hold-to-highlight */
    touch-action: none;

    -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 */
}