Fix modified tooltip (exact timestamp) flickering on/off because of timestamp updates every second. Made the tooltip follow mouse cursor.

frontend/src/assets/main.css

@@ -237,6 +237,7 @@ header nav.headermain {
   z-index: 101;
   content: attr(data-tooltip);
   position: absolute;
+  pointer-events: none;
   font-size: 1rem;
   text-align: center;
   padding: .5rem 1rem;
@@ -248,9 +249,6 @@ header nav.headermain {
   white-space: pre;
   animation: appearbriefly calc(10 * var(--transition-time)) linear forwards;
 }
-.modified [data-tooltip]:hover:after {
-  transform: translate(calc(1rem + 1ex + -100%), calc(-1.5rem + 100%));
-}
 @keyframes appearbriefly {
   from {
     opacity: 0;