CEC-2211 Change link to button (#185)

src/components/VehicleMap/popup.jsx

@@ -3,11 +3,11 @@ import Dialog from "@material-ui/core/Dialog";
 import MuiDialogTitle from "@material-ui/core/DialogTitle";
 import IconButton from "@material-ui/core/IconButton";
 import CloseIcon from "@material-ui/icons/Close";
+import VisibilityIcon from "@material-ui/icons/Visibility";
 import Typography from "@material-ui/core/Typography";
 
 import useStyles from "../useStyles";
 import DigitalTwin from "../DigitalTwin";
-import clsx from "clsx";
 import CANSignals from "../Cars/CANSignals";
 
 const VehiclePopUp = (props) => {
@@ -35,12 +35,9 @@ const VehiclePopUp = (props) => {
       <DialogTitle align="center" onClose={onClose}>
         {vin}
         {"  "}
-        <span
-          className={clsx(classes.pseudoLink, classes.breadcrumbs)}
-          onClick={toggleView}
-        >
-          {viewCAN ? "View Digital Twin" : "View CAN Signals"}
-        </span>
+        <IconButton>
+          <VisibilityIcon fontSize="inherit" onClick={toggleView} />
+        </IconButton>
       </DialogTitle>
       <div align="center" className={classes.popUpContent}>
         <p>