html {
  position: relative;
  height: 100vh;        /* 20.11.19 was: min-height: 100% */
}

body {
  height: 100%;
  overflow: hidden;
}

.noselect { /* https://stackoverflow.com/questions/826782/how-to-disable-text-selection-highlighting */
  -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, Opera and Firefox */
}

.textonlyselect {
  -webkit-touch-callout: text; /* iOS Safari */
    -webkit-user-select: text; /* Safari */
     -khtml-user-select: text; /* Konqueror HTML */
       -moz-user-select: text; /* Old versions of Firefox */
        -ms-user-select: text; /* Internet Explorer/Edge */
            user-select: text; /* Non-prefixed version, currently
                                  supported by Chrome, Opera and Firefox */
}