Added proper alert messages and improved security of import file.

styles/styles.css

@@ -0,0 +1,74 @@
+body { width: 450px; }
+ul, li { list-style: none; }
+
+li {
+    background-color: #0a1827;
+    color: #ffffff;
+    margin: 1em 0em;
+    padding: 1.5em;
+    text-align: center;
+}
+
+li:hover {
+    background-color: #1e4573;
+    cursor: pointer;
+}
+
+button {
+    background-color: #ffffff;
+    color: #000000;
+}
+
+#allertMessage {
+    position: absolute;
+    top: 5%;
+    z-index: 999;
+    width: 50%;
+    left: 25%;
+    padding: 0.5em;
+    text-align: center;
+    display: none;
+}
+
+#savedSessions {
+    max-height: 15em;
+    overflow-x: hidden;
+    overflow-y: auto;
+}
+
+#inputId {
+    display: none;
+}
+
+#lableTag {
+    top: 48%;
+    margin: 0 auto;
+    color: rgba(255, 255, 255, 0.5);
+}
+
+.container {
+    width: 100%;
+    height: 100%;
+    background-image: url('../images/icons/import.png');
+    background-repeat: no-repeat;
+    background-position: center;
+    text-align: center;
+    background-color: rgba(41, 95, 115, 0.85);
+    transition: 0.6s;
+}
+
+.container:hover {
+    transition: 0.6s;
+    background-color: rgba(41, 95, 115, 0.65);
+    cursor: pointer;
+}
+
+.selected {
+    background-color: #a3b83b;
+    box-shadow: 0px 5px 5px 5px #444444;
+}
+
+.icon {
+    width: 25px;
+    height: 25px;
+}