479e3ae7b94f06ee5374eb22a867a621a044a963
hiram
  Fri Oct 30 16:33:25 2020 -0700
add a verticle line to indicate where on the graph the pointer is refs #21980

diff --git src/hg/htdocs/style/mouseOver.css src/hg/htdocs/style/mouseOver.css
index 789b3c2..20f49fa 100644
--- src/hg/htdocs/style/mouseOver.css
+++ src/hg/htdocs/style/mouseOver.css
@@ -17,15 +17,26 @@
     top: 50%;
     left: 50%;
     transform: translate(-50%, -50%);
     background-color: white;
     padding: 1rem 1.5rem;
     width: 24rem;
     border-radius: 0.5rem;
 }
 
 .showMouseOver {
     opacity: 1;
     visibility: visible;
     transform: scale(1.0);
     transition: visibility 0s linear 0s, opacity 0.25s 0s, transform 0.25s;
 }
+
+.mouseOverHighlight {
+  border-left: 4px solid orange;
+  height: 60px;
+  position: absolute;
+  left: 0;
+  margin-left: -2px;
+  top: 0;
+  display: none;
+  z-index: 1000;
+}