app_needleplot loading data improvements

assets/needleplot-style.css

@@ -1,16 +1,46 @@
 .needle-upload {
-    width: 90%;
-    height: 11vh;
-    line-height: 11vh;
-    border-width: 1px;
-    border-style: dashed;
-    border-radius: 3px;
-    text-align: center;
-    margin: 3px;
-    display: inline-table;
+   width: 90%;
+   height: 11vh;
+   line-height: 11vh;
+   border-width: 1px;
+   border-style: dashed;
+   border-radius: 3px;
+   text-align: center;
+   margin: 10px;
+   display: inline-table;
 }
 
 .needle-tabs {
     max-height: 90vh;
     overflow-y: auto;
 }
+
+#needle-dataset-header-div {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-evenly;
+    align-items: center;
+
+}
+
+#needle-download-data-div {
+    display: none;
+}
+
+#needle-download-data-dropdown {
+    width: 140px;
+}
+
+.needle-dataset-header-div {
+    flex: 1;
+    margin-left: 5px;
+    margin-right: 5px;
+    margin-top: 2px;
+}
+
+.needle-horizontal-style{
+    display: flex;
+    flex-direction: row;
+    justify-content: space-evenly;
+    align-items: center;
+}