@yeebc/jupyterlab_neon_theme/style/custom.css

A flat, 80's neon inspired theme for JupyterLab 3.x.

/* Custom*/

/* Left and top tool bar*/
.jp-SideBar.p-TabBar, #jp-top-panel,
.jp-LabShell[data-shell-mode='single-document'] #jp-menu-panel {
  background-color: rgba(34, 33, 54, 0.65);  /* last value is the transparency */
}

/* Background */

/* Neon NIght Style */
.jp-LabShell {
  background: linear-gradient(to bottom right, rgba(0, 255, 255, 0.25), 
   rgba(180, 0, 255, 0.25), rgba(140, 0, 255, 0.25), rgba(255, 0, 100, 0.25));
}

.lm-DockPanel-tabBar .lm-TabBar-tab.jp-mod-current:before {
  background: linear-gradient(to right,
  #00000000, #3765e7, #a044ca, #ca44a9, #00000000)
}


 /* Neon Sunset Style */
 /* .jp-LabShell {
  background: linear-gradient(to bottom right, rgb(118 53 222 / 0.5),
  rgb(222 53 124 / 55%), rgb(244 218 36 / 0.6));
}

.lm-DockPanel-tabBar .lm-TabBar-tab.jp-mod-current:before{
  background: linear-gradient(to right,
  #00000000, #7334cb, #f36f8f, #ac7453, #00000000);
} */


/* or use an image as the background */
/* .jp-LabShell {
  background: url('./images/background.jpg') center/cover no-repeat;
}

.lm-DockPanel-tabBar .lm-TabBar-tab.jp-mod-current:before {
  background: linear-gradient(to right,
  #00000000, #3765e7, #a044ca, #ca44a9, #00000000)
} */


/* Fonts*/
/* Code font */
:root {
  /* Code font */
  --jp-code-font-family: Monaco, 'Source Code Pro', monospace;
/* Prompt number of cell */
  --jp-cell-prompt-font-family:  'Vibur';
}

/* Opened files tab bar */
.lm-DockPanel-tabBar .lm-TabBar-tab, h1 {
  font-family: 'Neon Bugler';
  font-size: 14px;
}

/* Search tool */
.jp-DocumentSearch-overlay *,  .filter .bp3-input {
  font-family: 'Neon Bugler';
  font-size: 15px;
}