Add range-slider stylesheet

dist/index.html

@@ -11,6 +11,7 @@
         <link rel="stylesheet" type="text/css" href="styles/menu.css"/>
         <link rel="stylesheet" type="text/css" href="styles/context-menu.css"/>
         <link rel="stylesheet" type="text/css" href="styles/annotation.css"/>
+        <link rel="stylesheet" type="text/css" href="styles/range-slider.css"/>
         <link href="styles/Login.css" rel="stylesheet">
         <style>
          * {margin: 0; padding: 0; list-style: none;}

dist/styles/range-slider.css

+.range-slider {
+  position: relative;
+}
+
+.range-slider .scale {
+  position: absolute;
+  background-color: #555;
+}
+
+.range-slider .knob {
+  position: absolute;
+}