gstlal.css: fix a few colors

gstlal-ugly/share/vis/gstlal.css

 body {
 	font: 10pt verdana;
-	color: white;
+	color: #ecf0f1;
 	background-color: #2c3e50;
 }
 
@@ -8,6 +8,14 @@ table {
 	color: black;
 }
 
+caption {
+	color: #ecf0f1;
+}
+
+img {
+	box-shadow: 10px 10px;
+}
+
 /* Style the list */
 ul.tab {
     list-style-type: none;
@@ -20,7 +28,7 @@ ul.tab li {float: left;}
 /* Style the links inside the list items */
 ul.tab li a {
     display: inline-block;
-    color: white;
+    color: #ecf0f1;
     text-align: center;
     padding: 10px 12px;
     text-decoration: none;