Update to Jupyterlab 1.0

Author: martinRenou

css/sidecar.css

@@ -1,11 +1,16 @@
 .jupyterlab-sidecar {
   background: var(--jp-layout-color0);
+  display: flex;
 }
 
 .jupyterlab-sidecar .jp-OutputPrompt.jp-OutputArea-prompt {
   display: none;
 }
 
+.jupyterlab-sidecar > .jp-OutputArea-child {
+  flex: 1;
+}
+
 .jp-SideBar.jp-mod-right .p-TabBar-tabCloseIcon {
   padding: 4px 0px 4px 4px;
   background-size: 16px;