refactor(code): Cleaned-up the code base

static/css/upload/sidebar.css

@@ -0,0 +1,50 @@
+.upload-statusbar {
+    grid-template-columns: 1fr 100px;
+}
+
+.side-stack {
+    width: var(--side-width);
+    min-width: var(--side-width);
+    max-width: var(--side-width);
+    height: 100%;
+    min-height: 0;
+    display: grid;
+    grid-template-columns: var(--side-width);
+    grid-template-rows: 350px 210px 1fr;
+    gap: 12px;
+    overflow: hidden;
+}
+
+.side-panel,
+.helper-window {
+    width: var(--side-width);
+    min-width: var(--side-width);
+    max-width: var(--side-width);
+    min-height: 0;
+    overflow: hidden;
+}
+
+.side-panel {
+    display: flex;
+    flex-direction: column;
+    box-shadow: inset -1px -1px 0 #808080, inset 1px 1px 0 #dfdfdf, 3px 4px 0 rgba(0,0,0,.38);
+}
+
+.side-body,
+.helper-body,
+.popup-body {
+    margin: 0 6px 6px;
+    padding: 9px;
+    color: #000000;
+    background-color: #ffffff;
+    background-image:
+        linear-gradient(180deg, rgba(255,255,255,.9), rgba(238,238,238,.58)),
+        repeating-linear-gradient(0deg, rgba(0,0,0,.025) 0 1px, transparent 1px 6px);
+    font-size: 13px;
+    line-height: 15px;
+}
+
+.side-body {
+    flex: 1 1 auto;
+    overflow: auto;
+}