Add ability to generate deeplinks URL for chart

src/style.css

@@ -395,6 +395,44 @@ details[open] summary {
 .lds-ripple div:nth-child(2) {
     animation-delay: -0.5s;
 }
+
+.tooltip {
+    position: relative;
+    display: inline-block;
+}
+
+.tooltip .tooltiptext {
+    visibility: hidden;
+    width: 280px;
+    background-color: #555;
+    color: #fff;
+    text-align: center;
+    border-radius: 6px;
+    padding: 5px;
+    position: absolute;
+    z-index: 1;
+    bottom: 80%;
+    left: -15%;
+    opacity: 0;
+    transition: opacity 0.3s;
+}
+
+.tooltip .tooltiptext::after {
+    content: "";
+    position: absolute;
+    top: 100%;
+    left: 50%;
+    margin-left: -5px;
+    border-width: 5px;
+    border-style: solid;
+    border-color: #555 transparent transparent transparent;
+}
+
+.tooltip:hover .tooltiptext {
+    visibility: visible;
+    opacity: 1;
+}
+
 @keyframes lds-ripple {
     0% {
         top: 36px;